Collapsible ruler

Details Collapsible ruler Collapsible ruler

1999-09-27

2000-06-20

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

1004

Patent

active

D04267842

REFERENCES:
patent: D158145 (1950-04-01), Staab
patent: D169226 (1953-03-01), Sandberg
patent: D285780 (1986-09-01), Wright et al.
patent: 2543476 (1951-04-01), Southern

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