Bathtub

Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified

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D2307

Patent

active

D02678136

REFERENCES:
patent: D82857 (1930-12-01), Steele
patent: D93716 (1934-10-01), Hesler
patent: D98051 (1936-01-01), Callahan
patent: D211877 (1968-08-01), Doman
patent: D216120 (1969-11-01), Niemann et al.
patent: D228133 (1973-08-01), Lippert et al.
patent: D233756 (1974-11-01), Schrock
patent: D235446 (1975-06-01), Korol
patent: D253547 (1979-11-01), Beddome et al.
patent: D255262 (1980-06-01), Beddome et al.
Domestic Engineering, Jun. 1967, p. 111.

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