US Patent: 35,812 - Improvement in Parallel Rulers


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US Patent: 35,812

Improvement in Parallel Rulers

Patentees:

Ira Myrick (exact or similar names) - Le Sueur, MN

James C. Dow (exact or similar names) - Henderson, MN

USPTO Classifications:

33/449

Tool Categories:

rules

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Granted:	Jul. 08, 1862

Patent Pictures:

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Description:

This draftsman's ruler uses a set of sring-loaded rollers to allow it to easily slide on the page, yet still allowing a slight push to hold it in place.