What prevents a customer from inserting money into an empty machine?

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What prevents a customer from inserting money into an empty machine?

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Our machines always vend the display newspaper. The back panel of the display has the words “SOLD OUT” silkscreened on it. The newspaper in the display blocks the “SOLD OUT” from view of the customer. When the last newspaper is sold, the “SOLD OUT” is exposed to view for the customer.

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