Such transparency also helps vending operators land accounts with commercial landlords, schools and municipalities, which typically pocket 5% to 25% of the vending revenue generated on their premises.

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He's paying tuition out of his own pocket, which is a challenge as his family tightens its belt.

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Prof Echizen said the glasses, which connect to a pocket power supply, would be reasonably priced, but there are some simpler alternatives.

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