Back pressure regulator

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

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D02825627

REFERENCES:
patent: D33306 (1900-10-01), Perkins
patent: D45994 (1914-06-01), Hedmark
patent: D96405 (1935-07-01), Murphy
patent: D218519 (1970-08-01), Mese
patent: 2568026 (1951-09-01), Pigott
patent: 2686534 (1954-08-01), Montelius
patent: 2831500 (1958-04-01), Fennema et al.
patent: 3236256 (1966-02-01), Valentine
patent: 3409037 (1968-11-01), Nelson
patent: 3487852 (1970-01-01), Kikendall
patent: 4321945 (1982-03-01), Chubat-Courrede

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