United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 205
e ends, a horn carried by thenipple, a removable plug carried by one ofthe tubes, a sleeve carried by the nipple andadapted to cut off communication betweenthe horn and one of the tubes, and means bywhich air may be conveyed through one orthe other of said tubes to the sound box. In testimonj^… … Ju^.3.
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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