Guide for patent draftsmen. - United States. (U.S. Dept. of Commerce, Patent and Trademark Office : For sale by the Supt. of Docs., U.S. G.P.O., 1989)
"PAT-012.1-7502."
Shipping list no.: 89-237-P.
"Selected rules of practice relating to patent drawings"--Cover.
Keywords: Mechanical drawing / Handbooks, manuals, etc.; Patents / United States / Handbooks, manuals, etc.