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Integrator
Planimeter
Planimeter
Army air force bubble sextant
Deformer apparatus
Brass plumb bob
Field protractor
Altimeter
Aviation altimeter
Dietzgen odometer
Security stopwatch
Directional compass
Surveying aneroid
Slide rule
Military slide rule
Slide rule
Logarithmic slide rule
Winslow strength-computing slide rule
Cylindrical calculator
Rolling parallel ruler

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