United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 239
«t No. 817,868. PATENTED APR. 17, 1906. C. A. PARSONS. SOUND REPRODUCER OR INTENSIFIER APPLICABLE TO PHONOGRAPHS, GRAMOPHONES, &c. APPLICATION FILED APH. 12, 1904. 3 SHEETS-SHEET 3. o % A % %_ i I TTldv J I I I L r … 7ffT Jfig.5. I \ FfigA. J^ig.6.
Phonograph · Patents
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