United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 767
nt the said mag-nets and adapted for movement with rela-tion thereto corresponding to the frequencyof the current passing through said magnets, 75an indicating-hand controlled by the move-ment of said armatures and a calibrated scaleassociated with said hand. In testimony whereof I affix my… … WITNESSES:
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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