Long rulers

Details Long rulers Long rulers

1984-11-16

1986-01-28

Little, Willis

Geometrical instruments

Area integrators

Electrical

33458, 33452, G01B 308

Patent

active

045662002

ABSTRACT:
A folding extension ruler is provided and consists of a device for extending each arm of the ruler to twice its length from middle of the arm, a device for locking each arm in its fully extended position and appropriate measuring indicia located on each arm and extending device.

REFERENCES:
patent: 596896 (1898-01-01), Massa
patent: 893035 (1908-07-01), Turner
patent: 1081995 (1913-12-01), Voggenreiter
patent: 1349349 (1920-08-01), Thiman
patent: 1985527 (1934-12-01), Taylor

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