Vacuum breaker valve

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

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D02787407

REFERENCES:
patent: D137235 (1944-02-01), Butler
patent: 3145724 (1964-08-01), Pelzer
patent: 3180352 (1965-04-01), Kersten et al.
patent: 3183924 (1965-05-01), Duchin

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