Cylinder Phonograph Stroboscopes
Six different stroboscopes for 50 and 60 cycle current
Designation: EPH-PHO
No.: 1865
Author/Owner/Origin: 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