David J. Gingery
Nick Engler
Lonnie Bird
Rockwell Manufacturing Company. Delta Power Tool Division.
Roger W. Cliffe
Ian Bradley
Unknown Author
Eric Stephenson
University of the State of New York. Bureau of Industrial and Technical Education.
Time-Life Books
Frederic George Birden
Jan Uniejewski
Wayne G. Broehl
Edward Whitney Miller
Fellows Gear Shaper Company
Fellows Gear Shaper Co