School cafeteria sound level monitor

Details School cafeteria sound level monitor School cafeteria sound level monitor

1983-06-30

1986-02-18

Corrigan, Jane E.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

D14 33, D14 35

Patent

active

D02826461

REFERENCES:
patent: D60293 (1922-01-01), Meden
patent: D211614 (1968-07-01), Warner
patent: D231236 (1974-04-01), Cresap
patent: 3304368 (1967-02-01), Ford et al.

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