Combined compass and thermometer

Details Combined compass and thermometer Combined compass and thermometer

1987-02-13

1990-09-25

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Temperature, humidity, atmospheric condition

Patent

active

D03107876

REFERENCES:
patent: D273847 (1984-05-01), Yusa
patent: D283683 (1986-05-01), Raitmaa
patent: D290093 (1987-06-01), Kramer et al.
patent: 1571697 (1926-02-01), Bernegau
patent: 2358589 (1944-09-01), Piffath
patent: 4438568 (1984-03-01), Kramer et al.

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