| Number | Name | Date | Kind |
|---|---|---|---|
| RE27549 | Flachbarth et al. | Jan 1973 | |
| 3334457 | Hudson et al. | Aug 1967 | |
| 3873136 | Curry | Mar 1975 | |
| 4272643 | Carroll et al. | Jun 1981 | |
| 4289370 | Storck | Sep 1981 | |
| 4323723 | Fork et al. | Apr 1982 | |
| 4336416 | Goodsell | Jun 1982 | |
| 4387949 | Haitmanek | Jun 1983 | |
| 4477694 | Kohaut | Oct 1984 | |
| 4496790 | Spencer | Jan 1985 | |
| 4507900 | Landis | Apr 1985 | |
| 5034567 | Mohr | Jul 1991 | |
| 5057647 | Bogden et al. | Oct 1991 |
| Number | Date | Country |
|---|---|---|
| 993450 | Oct 1951 | FRX |
| Entry |
|---|
| "Walkerduct Service Fittings" catalog SF582R (undated). |