US Patent: 1,427,039 - Attachment for Rules


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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:

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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.