| Number | Name | Date | Kind |
|---|---|---|---|
| 709144 | Edgerly | Sep 1902 | |
| 3202427 | Patent | Aug 1965 | |
| 3640535 | Gendler | Feb 1972 | |
| 3825264 | Dockum | Jul 1974 | |
| 4018443 | Bird | Apr 1977 | |
| 4560163 | Erickson | Dec 1985 | |
| 4775152 | Roehl | Oct 1988 | |
| 4854589 | Davis | Aug 1989 | |
| 4995611 | Goldthorpe | Feb 1991 | |
| 5029863 | Krawczyk et al. | Jul 1991 | |
| 5074556 | Loeppky et al. | Dec 1991 |
| Number | Date | Country |
|---|---|---|
| 2520627 | Aug 1983 | FRX |
| Entry |
|---|
| The New York Time, "Hockey Game of Fun", p. S25 (11 Dec. 1966). |
| "8 Great Gifts from Your Workshop", Mechanix Illustrated, (Dec. 1984) pp. 61-62. |