Instrument for sensing magnetic variations in the atmosphere

Details Instrument for sensing magnetic variations in the atmosphere Instrument for sensing magnetic variations in the atmosphere

1977-11-21

1980-04-15

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Radiation, e.g., geiger counter

D10109, D1004

Patent

active

D02547228

REFERENCES:
patent: D11755 (1880-04-01), Busteed
patent: D16765 (1886-07-01), Brown
patent: D21244 (1891-12-01), Helphenstine
patent: D51942 (1918-04-01), VanRaalte
patent: D82492 (1930-11-01), Foshay
patent: D89609 (1933-04-01), Aldrich
patent: D208422 (1967-08-01), Womack
patent: D238880 (1976-02-01), Elwell
patent: D241294 (1976-09-01), Zimbler

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