Number | Name | Date | Kind |
---|---|---|---|
2707145 | Sparrow et al. | Apr 1955 | |
3177111 | Larsen | Apr 1965 | |
3384534 | Kindron et al. | May 1968 | |
3472731 | Liebergott et al. | Oct 1969 | |
3481828 | Turner et al. | Dec 1969 | |
3507743 | Cartsunis et al. | Apr 1970 | |
3539445 | Crossland | Nov 1970 | |
3622444 | Andrews | Nov 1971 | |
3808012 | Tobar | Mar 1967 | |
4134787 | Eckert | Jan 1979 | |
4160693 | Lindahl | Jul 1979 |
Entry |
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Pulp & Paper Magazine of Canada, vol. 72, No. 1, Jan. 1971, pp. 80-84. _ |