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1 result for “page 2 of 7” · 2352ms

Patent

US2780765 Solar energy converting apparatus

Cited prior art · Daryl M Chapin, Calvin S Fuller and 2 more · United States · 1957

Page 1 Drawing sheet — no readable text. Page 2 United States Patent Office 2,780,765 atterated Feb. 5, 1957 However, it has