United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 699
able in-dependently of the coupling whereby saidvalve-plate may be rotated and the extent of 80said rotation indicated, said coupling beingalso provided in the end thereof adjacent tothe instrument with a supplemental vibra-tory device, consisting of a transversely-ar-ranged perforated disk and a… … p.mmv YYis£h&5< >5&S ^y
Phonograph · Patents
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