Combined heat exchanger and fireplace grate

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

Patent

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D2303

Patent

active

D02493586

REFERENCES:
patent: D228728 (1973-10-01), Bergstrom
patent: D240536 (1976-07-01), Christophel
patent: D242543 (1976-11-01), Betenbaugh, Jr.
patent: D242544 (1973-11-01), Betenbaugh, Jr.
patent: D243184 (1977-01-01), Solinski
patent: 3901212 (1975-08-01), Stites
patent: 3945369 (1976-03-01), Adams et al.

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