United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 801
ing the re-spective end plates, said matrices having 50molding-grooves on their opposing surfaces,and an intermediate plate likewise fitted onsaid center-pin and adapted t<> form a back-ing for the record material. In testimony whereof I have hereunto set Sl>my hand in the presence of two… … JZ&.Z
Phonograph · Patents
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