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References

  • 1
    J. J. Licari and P. C. Crepeau, U.S. Pat. 3,205,157 (September 7, 1965).
  • 2
    W. R. Workman, U.S. Pat. 3,074,869 (December 23, 1960).
  • 3
    W. S. Anderson, patents pending.
  • 4
    M. A. Lynch, Brit. Pat. 843,088 (August 4, 1960); C. A., 55, 6848 (1961).