U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 505
lST-vC+jO . . PHGio-urnc (No Model.) No. 489,423, 2 Sheets—Sheet 2. J. P. TIRRELL. ELECTRIC TIME ALARM. Patented Jan. 3, 1893. … V//TA/ES5JTS A/i£T/V7£7f? THE NORF»l<. PCTERS CO . nited States Patent Office. JACOB P. TIRRELL, OF BOSTON, ASSIGNOR TO HERBERT O. EDGERTON, OF GREENFIELD, MASSACHUSETTS. ELECTRIC TIME-ALARM. SPECIFICATION forming part of Letters Patent No. 489,423, dated January 3, 1893. Application filed March…
Clocks and watches
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