Number | Name | Date | Kind |
---|---|---|---|
1889600 | Hansen | Nov 1932 | |
3557892 | Burrough | Jan 1971 | |
4033518 | Fleming et al. | Jul 1977 | |
4184558 | de Buhr et al. | Jan 1980 | |
4738461 | Stephenson et al. | Apr 1988 |
Number | Date | Country |
---|---|---|
0108592 | Sep 1939 | AUX |
Entry |
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"Machine Design", The Penton Publishing Co. Section 8, pp. 144-145, Jun. 17, 1971. |