United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 89
and a collapsible section, the formertelescoping within the latter and operativeto expand the latter by a movement relativethereto. S. A horn comprising a rigid mouthpiece-section and a collapsible section, the former telescoping within the latter and the latterbeing expanded by^ a relatively… … JX 2ey.2.
Phonograph · Patents
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