Number | Name | Date | Kind |
---|---|---|---|
2880877 | Sambraus | Apr 1959 | |
3591492 | Neuspiel | May 1970 | |
3807560 | Pentz et al. | Apr 1974 | |
3822788 | Dunkers et al. | Jul 1974 | |
3969249 | Dodd et al. | Jul 1976 | |
4094785 | Booty | Jun 1978 | |
4190541 | Wade et al. | Feb 1980 | |
4687576 | Hardison | Aug 1987 |
Entry |
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Dorr-Oliver company engineering brochure. |