United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 111
frvootvtor IE MORRIS PETERS CO., PHOTCLITHO . WASHING J. M. McCALLIE. ADDIOMETER,APPLICATION PILED MAY 3. 1912. 1,127,908. Patented Feb. 9,1915. 3 SHEETS-SHEET 3. … ^ UNITED STATES PATENT OFFICE. JOSEPH M. McCALLIE, OF TRENTON, NEW JERSEY.AUDIOMETER. 1,127,908. Specification of Letters Patent. Patented Feb. 9, 1915. Application filed May 3, 1912. Serial No. 694,992. To all whom it may concern: Be it known that I, Joseph M. McCallie,of Trenton, in the county of…
Phonograph · Patents
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