Wall chime

Details Wall chime Wall chime

1984-10-29

1987-10-06

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D02921790

REFERENCES:
patent: D107411 (1937-12-01), Evans
patent: D107757 (1938-01-01), Evans
patent: D123063 (1940-10-01), Rittenhouse
patent: D180518 (1957-06-01), Jolly
patent: D182819 (1958-05-01), Jolly
patent: D198956 (1964-08-01), Kress
patent: D215188 (1969-09-01), Doggart
patent: D284171 (1986-06-01), Levin

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