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John Napier's Bones - Math, Geometry Material - Multiplication Table - Ancient Abacus - Historical Computing Device - analog calculator
John Napier's Bones: A Historical Computing DeviceRediscover the ..
$110.00
Pythagorean Theorem Proof, Demonstration of the Pythagorean theorem, Math, Geometry Material (Square-shaped pieces)
SPECIFICATIONS:Dimensions: 46x41x2 cm (18x16x0.7 inches)Material:..
$125.00
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