US Patent: 1,440,284 - Combination Rule


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US Patent: 1,440,284

Combination Rule

Patentee:

Otto L. Engstrom (exact or similar names) - South Bend, IN

USPTO Classifications:

33/471

Tool Categories:

rules : folding rules

layout tools : protractors

layout tools : levels

layout tools : calipers

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Sep. 20, 1921
Granted:	Dec. 26, 1922

Patent Pictures:

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Description:

This is a folding rule that does everything. It has a built in protractor and level vials to allow it to be used as a simple inclinometer, points to allow it to be used as dividers or calipers, and a caliper-style rule for measuring diameters.