Chemical treating block for a toilet tank

Environmental heating and cooling; fluid handling and sanitary e – Fluid handling or treatment equipment – Treatment

Patent

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Details

D21157, D28 82

Patent

active

D03250695

REFERENCES:
patent: D239807 (1976-05-01), Nelson
patent: D260281 (1981-08-01), Rist
patent: D287384 (1986-12-01), Sato
patent: D311265 (1990-10-01), Mendenhall

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