1
John D Arnason, Michael J Hampton: Register position sensing and controlling apparatus. Schlumberger Canada, Dale Gaudier, December 11, 1984: US04488152 (52 worldwide citation)

A visually and electronically readable motor driven register has a plurality of dependently rotatable, coaxial, incrementally positionable, number wheels which each carry a movable electrode fixed in a predetermined position relative to the numbers on each wheel. Adjacent each movable electrode is i ...


2
John D Arnason, Michael J Hampton, Carl M Terrier: Register position sensing and controlling apparatus. Schlumberger Canada, Dale Gaudier, September 11, 1984: US04471450 (4 worldwide citation)

A visually and electronically readable motor driven register has a plurality of dependently rotatable, coaxial, incrementally positionable, number wheels which each carry a movable electrode fixed in a predetermined position relative to the numbers on each wheel. Adjacent each movable electrode is i ...