| Number | Name | Date | Kind |
|---|---|---|---|
| 3454474 | Woods et al. | Jul 1969 | |
| 3723261 | Byers et al. | Mar 1973 | |
| 4356815 | Spanoudis | Nov 1982 | |
| 4585530 | McMullen et al. | Apr 1986 |
| Entry |
|---|
| 43rd Annual Metal Finishing Guidebook Directory, Metals and Plastics Publications, Inc., (1975), p. 186. |