Arkivism
Patent official, patent record files. Files of patents of which 2,180,00 have been issued. These files extend over 50 miles in total length and are kept in air conditioned portion of the building, washed air keeps paper from iridizing. Another old patent of drawing without the specification. This de
Public domain

Patent official, patent record files. Files of patents of which 2,180,00 have been issued. These files extend over 50 miles in total length and are kept in air conditioned portion of the building, washed air keeps paper from iridizing. Another old patent of drawing without the specification. This de

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 official, patent record files. Files of patents of which 2,180,00 have been issued. These files extend over 50 miles in total length and are kept in air conditioned portion of the building, was. 1940-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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