Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Horizontal and Directional Drilling Calculator
American Slide Chart Co. for Ryan Energy Technologies Inc.USA
Cardstock & Plastic
c. 199610.2 cm x 23.5 cmWell Drilling Industry

Notes: Used to calculate angles for directional drilling operations - often used in the oil well drilling industry

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