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US Patent: 1,501,169
Process of Making Drawing Instruments
Patentee:
Adolf W. Keuffell - Montclair, NJ

USPTO Classifications:
76/101.1

Tool Categories:
layout tools

Assignees:
Keuffel & Esser Co. - Hoboken, NJ

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Apr. 24, 1922
Granted: Jul. 15, 1924

Patent Pictures:
USPTO pdf tiff
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Description:
Clarence G. Campbell - patent attorney

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