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Patent Office files. Washington, D.C., Feb. 29. Employees in the patent office file room. Approximately 2,180,00 patents are kept on file for public use, 2-29-40
Public domain

Patent Office files. Washington, D.C., Feb. 29. Employees in the patent office file room. Approximately 2,180,00 patents are kept on file for public use, 2-29-40

Harris & Ewing · 1940-01-01 · photo, print, drawing

From the collection of Library of Congress. Free to download, adapt and use — no permission needed.

Subjects
washington (d.c.)district of columbiaglass negativesunited states
Credit linePatent Office files. Washington, D.C., Feb. 29. Employees in the patent office file room. Approximately 2,180,00 patents are kept on file for public use, 2-29-40. 1940-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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