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Machine Cancels — HandbooksISBN #18806524X. Hilbing, Jack. POTTER AND VAIL, THE MACHINES AND POSTAL MARKINGS ATTRIBUTED TO GIDEON POTTER AND EDWARD M. VAIL. Published 1998. LL. 82 p. Illus. Biographical sketches of Potter & Vail. The machine patents. Classification. Showing of cancels/w type, town used in, usage dates. Census of known covers. The cancels used only in Kewanee, Chicago, Galesburg & Canton.Literature #7874 | Price: $20.00 | Your Price: $16.00 Qty: 1