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Original file ‎(1,158 × 1,702 pixels, file size: 1.42 MB, MIME type: application/pdf, 10 pages)

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Description
English: 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.
Date
Source

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.

https://patentimages.storage.googleapis.com/39/90/bf/38440fe5d2922e/US1826501.pdf
Author Bornett L. Bobroff (15 Sep 1882 - 27 Dec 1945)

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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.

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