Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1988-07-18
1990-11-13
Burke, Wallace R.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
Patent
active
D03120562
REFERENCES:
patent: 59816 (1921-11-01), Clarke
patent: 1054793 (1913-03-01), Rieder
patent: 1092507 (1914-04-01), Putman
patent: 1720813 (1929-07-01), Agnew et al.
patent: 2470823 (1988-07-01), Luck
patent: 4030241 (1977-06-01), Gallagher
patent: 4221075 (1980-09-01), Gallagher
patent: 4483097 (1984-11-01), Piper
patent: 4637154 (1987-01-01), Lauback
patent: 4761149 (1988-08-01), Lauback
Burke Wallace R.
Dykas Frank J.
Jackson Marcus
Korfanta Craig M.
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