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JPH07230244A
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Card and implement for discriminating multiples of 19, 29, 39 and the like and implement
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JPH0713481A
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Discriminating card and implement for multiple of 7
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JPH07325542A
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Card and tool for deciding multiple of 11, 13 and like
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JPH075802A
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Card and tool for discriminating multiple of seven or seventeen
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JPH075803A
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Card and tool for discriminating multiple of seven
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JPH06149149A
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Card and tool for discriminating multiple of 7, 17, 37, and the like
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JPH06130894A
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Card and tool discriminating multiple of 13 and 23, and the like
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JPH06130893A
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Card and tool discriminating multiple of 31 and 41, and the like
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JPH06118869A
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Card and its implement for discriminating multiple, such as 19 and 29
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