A simple-to-use slide rule device for calculating the third variable given the other two (distance covered, given speed and elapsed time)
$ 6.60
$ 0.00
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A simple-to-use slide rule device for calculating the third variable given the other two (distance covered, given speed and elapsed time)
$ 37.33
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$ 7.79
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$ 47.99
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$ 6.60
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$ 16.20
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$ 11.39
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$ 6.59
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$ 14.97
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$ 28.91
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$ 27.53
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