Combined collapsible cup, compass and altimeter

Details Combined collapsible cup, compass and altimeter Combined collapsible cup, compass and altimeter

1987-10-30

1990-07-10

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03091163

REFERENCES:
patent: D289424 (1987-04-01), Huang
patent: 879753 (1908-02-01), Eckert
patent: 3285459 (1966-11-01), Gahn

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