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[[File:Patent for a Hostital indicator US1921149.pdf|thumb|Patented Aug. 8, 1933 1,921,149 UNITED STATES PATENT OFFICE 1,921,149 HOSPITAL INDICATOR Bornett L. Bobroff, Milwaukee, Wis. Application June 15, 1928. Serial No. 285,695 8 Claims. (Cl. 177-329)|left|698x698px]] |
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[[File:Patent for a Hostital indicator US1921149.pdf|thumb|Patented Aug. 8, 1933 1,921,149 UNITED STATES PATENT OFFICE 1,921,149 HOSPITAL INDICATOR Bornett L. Bobroff, Milwaukee, Wis. Application June 15, 1928. Serial No. 285,695 8 Claims. (Cl. 177-329)|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 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 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]] |
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[[File:Patent for a Signaling device US2005714.pdf|thumb|Patented June 18, 1935 2,005,714 UNITED STATES PATENT OFFICE 2,005,714 SIGNALING DEVICE Bornett L. Bobroff, Racine, Wis. Application August 8, 1929, Serial No. 384,319 3 Claims. (Cl. 177-329)|left|698x698px]] |
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[[File:Patent for a Signaling device US2005714.pdf|thumb|Patented June 18, 1935 2,005,714 UNITED STATES PATENT OFFICE 2,005,714 SIGNALING DEVICE Bornett L. Bobroff, Racine, Wis. Application August 8, 1929, Serial No. 384,319 3 Claims. (Cl. 177-329)|left|698x698px]] |