OPINION
In this action, the plaintiffs challenge the third remand determination of the Department of Labor (“Labor”) regarding their claim for trade adjustment assistance (“TAA”) benefits under the Trade Act of 1974, 19 U.S.C. § 2271 - 2395 (2000) (“the Act”). The plaintiffs ask the court to decide whether the former employees of Murray Engineering, Inc., Complete Design Service (“Murray”) are eligible for TAA benefits pursuant to 19 U.S.C. § 2272 (West Supp. 2005) where (a) Murray’s workers produceddesigns for dies, and (b) even though there have been no increased imports of designs themselves,' Murray’s customers may have imported articles that are in the design’s chain of production, such as dies made from Murray’s designs; parts or machinery made from such dies, and machinery produced from such dies or parts, which may have ended up in constructed automobiles. The court affirms Labor’s negative determination on remand that, to the extent that there were imports of articles in the designs’ chain of production, such articles were not “directly competitive” with the designs themselves.
*649Background
Kenneth Walter was an employee of Murray, a Michigan corporation that creates designs to make machines, tools, gauges, dies, molds, and fixtures for hydraulic, pneumatic, mechanical, and electrical systems (“dies”) used in the manufacture of certain automotive products. Murray Engineering, Inc. Complete Design Service, Flint, Michigan, 69 Fed. Reg. 52,935, 52,935 (Dep’t Labor Aug. 30, 2004) (notice of negative determination on remand) (“Second Remand Determ”). On January 15, 2003, Walter filed a petition for TAA benefits on behalf of Murray’s former employees.1 Second Remand Determ. 69 Fed. Reg. at 52,935. Since then, Labor has made four determinations.2 In its determination after the third remand, Labor concluded that the workers are not eligible for TAA benefits, because, contrary to the requirements of § 2272(a), Murray had not moved any design work abroad and imports of articles like or directly competitive with those produced by the workers had not increased. Labor also concluded that the workers do not qualify as adversely affected secondary workers as required under § 2272(b). Murray Engineering, Inc. Complete Design Service, Flint, MI, 70 Fed. Reg. 12,902, 12,902 (Dep’t Labor Mar. 16, 2005) (notice of negative determination on remand) (“Third Remand Determ.”).
*650Standard of Review
Title 19 U.S.C. § 2395(b), (c) empowers this Court to review determinations by the Secretary of Labor finding workers ineligible for TAA benefits in order to ensure that the determinations are supported by substantial evidence and are made in accordance with law. 19 U.S.C. § 2395(b), (c); see also Int’l Union v. Marshall, 584 F.2d 390, 396 n.26 (D.C. Cir. 1978) (“[T]he rulings made on the basis of those findings [must] be in accordance with the statute and not be arbitrary and capricious, and for this purpose the law requires a showing of reasoned analysis.”).
Discussion
The court finds that Labor properly determined (1) that the workers do not satisfy § 2272(a)’s requirements that the employer either suffer declining business due to increased imports of articles like or directly competitive with its own products and (2) that the workers do not qualify as adversely affected secondary workers as required by § 2272(b).
1. Labor Properly Determined That The Workers Do Not Satisfy § 2272(a)’s Requirements That The Employer Suffer Declining Business Due to Increased Imports Of Articles Like Or Directly Competitive With Domestic Articles
Labor’s third remand determination focused on evidence of increased imports of like or directly competitive articles. In making its determination, Labor referred to its own regulation, 29 C.F.R. § 90.2, for the definition of the term, “like or directly competitive.” Third Remand Determ., 70 Fed. Reg. at 12,903.3 In pertinent part, the regulation reads:
Like or directly competitive means that like articles are those which are substantially identical in inherent or intrinsic characteristics (i.e., materials from which the articles are made, appearance, quality, texture, etc.); and directly competitive articles are those which, although not substantially identical in their inherent or intrinsic characteristics, are substantially equivalent for commercial purposes (i.e., adapted to the same uses and essentially interchangeable therefor).
An imported article is directly competitive with a domestic article at an earlier or later stage of processing, and a domestic *651article is directly competitive with an imported article at an earlier or later stage of processing, if the importation of the article has an economic effect on producers of the domestic article comparable to the effect of importation of articles in the same stage of processing as the domestic article.
29 C.F.R. § 90.2 (2003) (emphasis in original).4
As such, Labor explained that the articles that are in the chain of production are not “directly competitive” with the workers’ designs for dies, because those designs do not represent an “earlier stage of processing” of such dies or the products manufactured on such dies. Third Remand Determ, at 12,903.5 Labor found that an article at an “earlier stage of processing” than a finished article may only be “directly competitive” with that finished article if it remains “substantially the same” during such stages of processing and is “not wholly transformed into a different article.” Id. at 12,903 (referring to the legislative history of the Trade Expansion Act of 1962,6 H.R. Rep. *652No. 87-1818 at 24 (1962) (“The term ‘earlier . . . stage of processing’ contemplates that the article remains substantially the same during such stages of processing, and is not wholly transformed into a different article.”)). Noting that the legislative history’s language parallels the definition of “directly competitive” in 29 C.F.R. § 90.2, Labor argued that past TAA cases7 support the limited construction of the *653term, “earlier stage of processing.” Third Remand Determ, at 12,903. Applying this definition to the instant case, Murray’s designs for dies may not be considered “directly competitive” with the dies themselves even if the court assumed that Murray’s customers imported dies.8 Nor are they “directly competitive” with the parts manufactured by the dies or the machinery produced from such dies, which may have produced parts that ended up in constructed automobiles, because, under Labor’s interpretation, they cannot be considered to be “an earlier stage of processing.”
Labor also noted that the meaning of “directly competitive” has been limited by the Court of International Trade. Sugar Workers Union v. Dole, 14 CIT 861, 867, 755 F. Supp. 1071, 1075 (1990) (announcing that “[i]t is not enough . . . that the imports compete with or affect the . . . product indirectly or circuitously,” because Congress intended to protect only those persons and industries displaced by directly competitive imports). This limitation was illustrated in an earlier case, Mach. Printers & Engravers Ass’n v. Marshall, in which the D.C. Circuit held that imported textile fabrics, which were harming the domestic textile industry, were not directly competitive with engraved rollers and screens made by the workers seeking assistance, and which were used to print patterns on textiles. 595 F.2d 860, 861-62 (D.C. Cir. 1979). Like the imported textile fabrics in Mach. Printers, the articles that are in the chain of production of Murray’s design may be considered to be not directly competitive with Murray’s designs, because those articles are “neither interchangeable with nor substitutable” for Murray’s designs. Id. at 862. Also, like Murray’s designs in the instant case, the engraved rollers and screens in Mach. Printers, although necessary for the look or design of the final article, are not incorporated into it. The workers’ designs, therefore, may be “ ‘so far removed therefrom in the chain of production as to make them totally unrelated’ ” to the articles in the *654design’s chain of production. Id. (quoting United Shoe Workers, 506 F.2d at 177).
Moreover, Murray’s designs do not “remain [ ] substantially the same during [the] stages of processing.” H.R. Rep. No. 87-1818 at 24 (1962). Murray’s designs cannot be “processed directly” into any of the articles in the design’s chain of production. Murray’s designs, instead, are “wholly transformed into a different article,” namely the dies, auto parts, or even cars. Id. Because even components incorporated into a finished article may not be “directly competitive” with the finished article,9 Murray’s designs are even further removed from being considered “directly competitive” with the articles in the design’s chain of production, because the designs are neither processed nor incorporated into those articles.
2. Labor Properly Determined That The Workers Do Not Qualify As Adversely Affected Secondary Workers Under § 2272(b)
Labor found that the workers do not qualify as adversely affected secondary workers under § 2272(b) of the Trade Act, because Murray did not do any business with any TAA-certified company during the relevant time period. Third Remand Determ, at 12,905 (revealing that Murray last did business with Lamb Technicon, a TAA-certified company, in 1999). Labor argues that the relevant time period consisted of the two years prior to the former employees’ last partial or complete application for benefits. Def.’s Resp. Pl.’s Comments Concerning Third Remand Results at 12 (“Def.’s Resp.”).10 The court has held that Labor may limit its investigation to the two years preceding the workers’ separation. See Stipe v. U.S. Dep’t of Labor, 9 CIT 543, 544 (1985) (citing United Glass & Ceramic Workers v. Marshall, 584 F.2d 398 406-407 (1978), Int’l Union v. Donovan, 8 CIT 13, 18 (1984).11
*655Indeed, some limitation appears reasonable; because Labor can only certify workers for adjustment assistance as secondarily affected workers if the loss of business with the certified firm “contributed importantly” to the workers’ separation, there must be some period in time at which a loss of business becomes too remote from the separation to be held to “contribute importantly” to such separation. However, Int’l Union makes clear that the two-year period of investigation may not always be adequate, and that persuasive reasons may be adduced for extending it.
Here, plaintiffs argue that the relevant time period should be extended, but their arguments are not directed at the secondarily-affected worker analysis performed by Labor. Accordingly, the plaintiffs have not provided a persuasive reason to extend the period of investigation with regard to this finding.12
Conclusion
Labor’s interpretation of 29 C.F.R. § 90.2 holds that articles at different stages of processing are only directly competitive for purposes of the Trade Act of 1974 when both are “substantially the same” and neither has been “wholly transformed into a different article.” This interpretation is based directly on the legislative history of the term “earlier or later stage of processing,” and is not controverted by any statutory language. The court therefore upholds Labor’s interpretation as in accordance with law. Moreover, substantial evidence supports Labor’s findings that Murray’s designs, which are not corpo-rally embodied in any downstream article, are not “substantially the same” as any of those downstream articles. Finally, Murray produced no component parts for a TAA-certified business during the relevant time period. Accordingly, the court affirms Labor’s determination.