Abstract
Get full access to this article
View all access options for this article.
References
1.
Graham, N. B.
and
Murdock, J. D.
, U.S. Patent 3,311 ,573
2.
Bowering, W. D.
and
Graham, N. B.
, U.S. Patent 3,311 ,574
3.
Graham, N. B.
, U.S. Patent 3,311 ,575
4.
Graham. N. B.
, U.S. Patent 3,318 ,824