United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 447
within asound-conveyer, a valve-plate adjustably 25mounted upon said fixed plate and means op-erable from without said conveyer for adjust-ing the position of said valve-plate relativelyto the opening in said fixed plate. In witness whereof I have hereunto sub- 30scribed my name in the presence of…
Phonograph · Patents
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