Measuring – testing – or signalling instruments – Security or signal instrument or casing – Elevator signal or call unit
Patent
1989-05-12
1991-06-11
Burke, Wallace R.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Elevator signal or call unit
D20 10
Patent
active
D03174182
REFERENCES:
patent: D262257 (1982-01-01), Bryan
patent: D268025 (1983-02-01), Bevilaqua et al.
patent: D304738 (1989-11-01), Jones
patent: 4182061 (1980-01-01), English
PTL Equipment Mfg. Co. Inc., Elevator Button Panel, panel used in New York Housing since 1971.
Davis Steven B.
Weirsman William
Burke Wallace R.
Jackson Marcus
Jones William W.
Otis Elevator Company
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