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US Patent: 63,060
Book Keeper's Ruler
Patentee:
A. O. Latham - Wheeling, WV

USPTO Classifications:
33/473

Tool Categories:
layout tools : bevels
rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Thos. H. Logan
M. Y. Watman

Patent Dates:
Granted: Mar. 19, 1867

Patent Pictures:
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Description:
Ruler with a second ruler swivelling on a pin that allows angled lines to be drawn without moving the main ruler and due to not having to move the primary ruler prevents smudging lines.

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