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Slide rule
Military slide rule
Slide rule
Logarithmic slide rule
Winslow strength-computing slide rule
Cylindrical calculator
Rolling parallel ruler
Precision protractor
Wrico lettering set
Wrico lettering set
Wrico lettering set
Wrico lettering set
Keuffel and Esser Le Roy lettering set
Keuffel and Esser Le Roy lettering set
Dotting instrument
Keuffel and Esser drafting set
Tower drafting set
Proportional dividers
Proportional dividers
Proportional dividers

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