. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . 1 No. 146,812 T. A. raph Sig nal-Boxes. Patented Jan, 27, AM. PHOW LITHOGRAPHIC Co. M. Y. lOSBORNES PPOceSS, United States Patent Office. THOMAS A. EDISON, OF NEWABK, NEW JEBSEY, ASSIGNOB TO AMEBICANDISTRICT TELEGRAPH COMPANY, OF NEW YORK, N. Y. IMPROVEMENT IN TELEGRAPH-SIGNAL BOXES. Specification formiDg part of Letters Patent No. 140,812, dated January 27, 1W4 : application filed December 3, 1872. To all whom it may concern: Be it known that I, Thomas A. Edison,of Newark, in the county of Essex
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . 1 No. 146,812 T. A. raph Sig nal-Boxes. Patented Jan, 27, AM. PHOW LITHOGRAPHIC Co. M. Y. lOSBORNES PPOceSS, United States Patent Office. THOMAS A. EDISON, OF NEWABK, NEW JEBSEY, ASSIGNOB TO AMEBICANDISTRICT TELEGRAPH COMPANY, OF NEW YORK, N. Y. IMPROVEMENT IN TELEGRAPH-SIGNAL BOXES. Specification formiDg part of Letters Patent No. 140,812, dated January 27, 1W4 : application filed December 3, 1872. To all whom it may concern: Be it known that I, Thomas A. Edison,of Newark, in the county of Essex and Stateof New Jersey, h<?ve invented an Improve-ment in Telegraphic Alarm and Signal Ap-paratus, of which the following is a specifica-tion : Before my invention, an alarm appara-tus and local telegraph had been inventedfor communicating from several houses orbuildings in a telegraphic circuit with the cen-tral station, for calling police, messenger, orother service, as seen in Letters Patent ,841, granted to E. A. Calahan. My in-vention is an improvement upon the same,and a modification of Letters Patent ,526; and consists in an ad
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