Sound level meter

Details Sound level meter Sound level meter

1976-01-30

1978-02-07

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Food preparation type

D1004

Patent

active

D02471612

REFERENCES:
patent: D215238 (1969-09-01), Seidel
patent: D229968 (1974-01-01), Williams
patent: D242531 (1976-11-01), Guimond
Industrial Equip. News, 2/75, p. S-33, Sound Level Meter at top right.
Industrial Design, 6/74, p. 61, Elec. Thermometer at top.

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