Oblong validation

"Inductive coin validation system and payphone using it: A coin validation arrangement, usable for example in pay telephones, uses one or more inductive sensors (17) having a small effective magnetic field so that the inductive sensor (17) responds only to the material of a strip across the coin. Preferably a plurality of inductive sensors (17) are used, mounted at different heights above the floor (23) of the coin guide, at different positions along the coin path. At each position along the coin path there may be either one or a plurality of inductive sensors (17). Preferably the inductive sensors (17) are surface mount inductors on a printed circuit board which forms part of one wall (19) of the coin guide. Such arrangements are particularly useful for recognising coins having an outer ring made of a different material from the central disc, and for distinguishing such coins from uniform composition coins." (Free Patents Online)

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