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US Patent: 1,427,039
Attachment for Rules
Patentee:
Raymond Trane (exact or similar names) - Omaha, NE

USPTO Classifications:
33/452

Tool Categories:
rules : rule attachments

Assignees:
Cordelia Boon - Omaha, NE
Eustace E. Ashley - Omaha, NE

Manufacturer:
Not known to have been produced

Witnesses:
Jas. Bureiss

Patent Dates:
Applied: Aug. 21, 1922
Granted: Aug. 22, 1922

Patent Pictures:
USPTO (New site tip)
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Report data errors or omissions to steward Ralph Brendler
Description:
This patent describes a spring-loaded prong affixed to a ruler, allowing it to be locked in position on a sheet of paper. The drawing and text descibe its primary use as for parallel rules used in navigation.

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