United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 357
y-grooved workingsurface in the form of a truncated cone, thethickest portion of the disk being at the cen-ter and the thickness diminishing toward theperiphery, so as to provide a maximum 60strength and stiffness. In witness whereof I have hereunto signedmy name, this 4th day of April, 1905. in… … 9} $Vl
Phonograph · Patents
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