Post level

Details Post level Post level

1991-11-19

1992-12-29

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03320588

REFERENCES:
patent: D253581 (1979-12-01), Vander Werf
patent: D257330 (1980-10-01), Vander Werf
patent: D261626 (1981-11-01), Vander Werf
patent: D288539 (1987-03-01), Vander Werf
patent: D288540 (1987-03-01), Vander Werf
patent: D288541 (1987-03-01), Vander Werf
patent: D289266 (1987-04-01), Vander Werf
patent: 3820249 (1974-06-01), Stone
patent: 4976040 (1990-12-01), Mish et al.

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