Door message recorder

Details Door message recorder Door message recorder

1998-09-03

1999-10-19

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D04154444

REFERENCES:
patent: D199446 (1964-10-01), Stevenson
patent: D199875 (1964-12-01), Stevenson
patent: D264196 (1982-05-01), Doggart
patent: D275088 (1984-08-01), Kachi et al.
patent: D326238 (1992-05-01), Spinosa
patent: D392577 (1998-03-01), Pun

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