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[[File:Patent for a Switch construction for signaling systems US1872395.pdf|thumb|Patented Aug. 16, 1932 1,872,395 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF RACINE, WISCONSIN SWITCH CONSTRUCTION FOR SIGNALING SYSTEMS Application filed November 6, 1929. Serial No. 405,105.|left|698x698px]] |
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[[File:Patent for a Switch construction for signaling systems US1872395.pdf|thumb|Patented Aug. 16, 1932 1,872,395 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF RACINE, WISCONSIN SWITCH CONSTRUCTION FOR SIGNALING SYSTEMS Application filed November 6, 1929. Serial No. 405,105.|left|698x698px]] |
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[[File:Patent for a Switch for signaling systems for vehicles US1886078.pdf|thumb|Patented Nov. 1, 1932 1,886,078 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF RACINE, WISCONSIN SWITCH FOR SIGNALING SYSTEMS FOR VEHICLES Application filed March 31, 1930. Serial No. 440,287.|left|698x698px]] |
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[[File:Patent for a Switch for signaling systems for vehicles US1886078.pdf|thumb|Patented Nov. 1, 1932 1,886,078 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF RACINE, WISCONSIN SWITCH FOR SIGNALING SYSTEMS FOR VEHICLES Application filed March 31, 1930. Serial No. 440,287.|left|698x698px]] |
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[[File:Patent for a Switch for signaling systems for automotive vehicles US1886519.pdf|thumb|Patented Nov. 8, 1932 1,886,519 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF RACINE, WISCONSIN SWITCH FOR SIGNALING SYSTEMS FOR AUTOMOTIVE VEHICLES Application filed November 12, 1930. Serial No. 495,148.|left|698x698px]] |
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[[File:Patent for a Signal switch construction for automotive vehicles US1909040.pdf|thumb|Patented May 16, 1933 1,909,040 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF RACINE, WISCONSIN SIGNAL SWITCH CONSTRUCTION FOR AUTOMOTIVE VEHICLES Application filed May 10, 1930. Serial No. 451,254.|left|698x698px]] |
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[[File:Patent for a Signal switch construction for automotive vehicles US1909040.pdf|thumb|Patented May 16, 1933 1,909,040 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF RACINE, WISCONSIN SIGNAL SWITCH CONSTRUCTION FOR AUTOMOTIVE VEHICLES Application filed May 10, 1930. Serial No. 451,254.|left|698x698px]] |
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[[File:Patent for a Signaling device US1969116.pdf|thumb|Patented Aug. 7, 1934 1,969,116 UNITED STATES PATENT OFFICE 1,969,116 SIGNALING DEVICE Bornett L. Bobroff, Racine, Wis. Application August 8, 1929, Serial No. 384,279 2 Claims. (CI. 177-329)|left|698x698px]] |
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[[File:Patent for a Signaling device US1969116.pdf|thumb|Patented Aug. 7, 1934 1,969,116 UNITED STATES PATENT OFFICE 1,969,116 SIGNALING DEVICE Bornett L. Bobroff, Racine, Wis. Application August 8, 1929, Serial No. 384,279 2 Claims. (CI. 177-329)|left|698x698px]] |