US1857447 Heating system for bake ovens
Cited prior art · Engels Eugene Oscar · Baker Perkins Inc · United States · 1932
Page 1 Drawing sheet — no readable text. Page 2 Patented May 10, 1932 1,857,447 Application filed September 11, 1930, Serial No.
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US1777472 Carburetion apparatus
Cited prior art · Frank C Mock, John A Dienner and 1 more · United States · 1930
Page 1 Drawing sheet — no readable text. Page 2 Drawing sheet — no readable text. Page 3 Drawing sheet — no readable text.
US1753227 Solar water-heating system
Cited prior art · Henry A Wheeler, Frank J Bentz and 3 more · United States · 1930
Page 1 Drawing sheet — no readable text. Page 2 Drawing sheet — no readable text. Page 3 Patented Apr. 8, 1930 1,753,227
US1863636 Gaseous fuel mixture
Cited prior art · George C Quelch · Union Carbide and Carbon Research Laboratories Inc · United States · 1932
gas mainly methane.gas,My primary above described as being gaseous mixture con o Page 2 even where the hydrogen is expanded in one sisting mostly of methane
US1782732 Cover glass
Cited prior art · Lebby States Lee · Corning Glass Works · United States · 1930
Page 1 Drawing sheet — no readable text. Page 2 Patented Nov. 25, 1930 UNITED STATES PATENT OFFICE STATES LEELEBBY, OF CORNING,