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[[File:Patent for a System for signaling US1367583.pdf|thumb|UNITED STATES PATENT OFFICE. BORNETT L. BOBROFF, OF MILWAUKEE, WISCONSIN. SYSTEM FOR SIGNALING. 1,367,583.Specification of Letters Patent. Patented Feb. 8, 1921. Application filed April 2, 1918. Serial No. 226,189.|left|698x698px]] |
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[[File:Patent for a System for signaling US1367583.pdf|thumb|UNITED STATES PATENT OFFICE. BORNETT L. BOBROFF, OF MILWAUKEE, WISCONSIN. SYSTEM FOR SIGNALING. 1,367,583.Specification of Letters Patent. Patented Feb. 8, 1921. Application filed April 2, 1918. Serial No. 226,189.|left|698x698px]] |
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[[File:Patent for a Hospital signaling system US1751972.pdf|thumb|Patented Mar. 25, 1930 1,751,972 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF MILWAUKEE, WISCONSIN HOSPITAL SIGNALING SYSTEM Appliention filed November 17, 1924. Serial No. 750,302.|left|698x698px]] |
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[[File:Patent for a Hospital signaling system US1751972.pdf|thumb|Patented Mar. 25, 1930 1,751,972 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF MILWAUKEE, WISCONSIN HOSPITAL SIGNALING SYSTEM Appliention filed November 17, 1924. Serial No. 750,302.|left|698x698px]] |
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[[File:Patent for a Push button US1761867.pdf|thumb|Patented June 3, 1930 1,761,867 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF MILWAUKEE, WISCONSIN PUSH BUTTON Application filed April 4, 1928. Serial No. 267,454.|left|698x698px]] |
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[[File:Patent for a Signaling system US1826501.pdf|thumb|Patented Oct. 6, 1931 1,826,501 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF MILWAUKEE, WISCONSIN SIGNALING SYSTEM Application filed July 11, 1927. Serial No. 204,892.|left|698x698px]] |
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[[File:Patent for a Signaling system US1826501.pdf|thumb|Patented Oct. 6, 1931 1,826,501 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF MILWAUKEE, WISCONSIN SIGNALING SYSTEM Application filed July 11, 1927. Serial No. 204,892.|left|698x698px]] |
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[[File:Patent for a Hospital signaling system US1867134.pdf|thumb|Patented July 12, 1932 1,867,134 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF MILWAUKEE, WISCONSIN HOSPITAL SIGNALING SYSTEM Application filed April 4, 1928. Serial No. 267,455.|left|698x698px]] |
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[[File:Patent for a Hospital signaling system US1867134.pdf|thumb|Patented July 12, 1932 1,867,134 UNITED STATES PATENT OFFICE BORNETT L. BOBROFF, OF MILWAUKEE, WISCONSIN HOSPITAL SIGNALING SYSTEM Application filed April 4, 1928. Serial No. 267,455.|left|698x698px]] |