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Cylinder Phonograph Stroboscopes

Six different stroboscopes for 50 and 60 cycle current

Designation: EPH-PHO
No.: 1865
Author/Owner/Source: John Petty
Pub. Date: ?
Description: Size: 8.5×11, single sheet
Language: Eng
Source: Polan
Loan/Own: Gift
Entry Date: 9/8/2013
No. docs.: 1