Chemical treating block for a toilet tank

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

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D21157, D28 82

Patent

active

D03250687

REFERENCES:
patent: D260281 (1981-08-01), Rist
patent: D311265 (1990-10-01), Mendenhall
Hong Kong Household 7.1984, p. 10, Dolphin Trays.
Gentle Giants Fall 1984 Cat. p. 22 right, C Dolphin Magnet.

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