| http://www.w3.org/ns/prov#value | - FIG. FIG. 3 Ralph W Hippen IN VE N TOR A TTORNE Y ZZMfW PATENTEU FEB 9 I971 SHEET 2 [IF 2 Ralph W Hippen I INVENTOR B Y MW ATTORNEY FAIL-SAFE WATER PURIFYING APPARATUS BACKGROUND OF THE INVENTION It has been proposed heretofore to purify various materials, especially liquids, such as water, by exposing the same to ultraviolet light.
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