United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 951
, ! u mi FipT.l. WlnrjsJ £av& n/e: Jsl t a f\- Y^< ■ffUJVJL. ru3 ff-rAxxst^UJS)^ fiz <£ZZS^=y<fv No. 854,120. PATENTED MAY 21, 1907. J. S. STONE.DEVICE FOR AMPLIFYING ELECTRICAL CURRENTS. APPLICATION FILED MAY 23, 1906. 2 8HEET8-8HEET 2 Wi-rpJ ^2S … n pslN/EirsJ-rnFV:: UNITED STATES PATENT OFFICE. JOHN STONE STONE, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO JOHNA. CHRYSTIE, LOUIS DUNCAN, AND WALTER H. TURNER, ALL OF NEWYORK, N. Y. DEVICE FOR AMPLIFYING ELECTRICAL CURRENTS. 10 IS 20 25 3° 35 Mo. 854,120. Specification of Letters Patent.…
Phonograph · Patents
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