Abstract
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References
1.
Simroth, D. W.
,
F. E. Critchfield
and
E. G. Shook
, U.S. Patent 4,463,107 (July 31, 1984 ).
2.
Simroth, D. W.
,
F. E. Critchfield
and
R. C. Myerly
, U.S. Patent 4,652,589 (March 24, 1987 ).