Number | Name | Date | Kind |
---|---|---|---|
2408626 | Green | Oct 1946 | |
2812957 | Sarlund | Nov 1957 | |
2828065 | Heywood | Mar 1958 | |
3095088 | Blaikie et al. | Jan 1963 | |
3670927 | Hubbard | Jun 1972 | |
3740081 | Whipperman | Jun 1973 | |
3835988 | Buttery | Sep 1974 | |
3902655 | Huffman | Sep 1975 | |
3945870 | Johnsen | Mar 1976 | |
3955750 | Huffman | May 1976 | |
4010889 | Allen et al. | Mar 1977 | |
4033611 | Johnsen | Jul 1977 | |
4241834 | Beaucham | Dec 1980 |
Number | Date | Country |
---|---|---|
2023498 | Jan 1980 | GBX |
Entry |
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Two one-page sketch (by inventors) reproductions (from memory) of a prior format, sample, since destroyed and discarded, used by inventors here in conceiving the claimed format. |