Humidifier for use with a portable oxygen unit

Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Air treatment

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D03385191

REFERENCES:
patent: 2413494 (1946-12-01), Fortney
patent: 3096817 (1963-07-01), McKenna
patent: 3107669 (1963-10-01), Gross
patent: 3730497 (1973-05-01), Schmitt
patent: 3979485 (1976-09-01), Hoag
patent: 4540529 (1985-09-01), Koszyk
Handbook of Pictorial Symbols, .COPYRGT.1976, p. 111, water drop symbol A, lower right side of page.

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