Portable door chime

Details Portable door chime Portable door chime

1994-12-01

1995-10-10

Word, A. Hugo

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

D20 42, D11131

Patent

active

D03630390

REFERENCES:
patent: D98912 (1936-03-01), Blumenthal
patent: D158482 (1950-05-01), Mandel
patent: D181146 (1957-10-01), Heard
patent: D304737 (1989-11-01), Mori
patent: D317944 (1991-07-01), George
patent: D318494 (1991-07-01), Bencivenga
patent: D326870 (1992-06-01), Giammanco
patent: D345766 (1994-04-01), Goldman et al.

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