 
                 Patent Grant
 Patent Grant
                     D306350
 D306350
                    | Number | Name | Date | Kind | 
|---|---|---|---|
| D27673 | Greger | Sep 1897 | |
| D193210 | Hallock | Jul 1962 | |
| D238065 | Harvey | Dec 1975 | |
| D270292 | Johnson | Aug 1983 | |
| 2615526 | Lane | Oct 1952 | |
| 3279134 | Donovan | Oct 1966 | |
| 3295272 | Kanno | Jan 1967 | |
| 3318057 | Norsworthy | May 1967 | |
| 3407558 | Resch | Oct 1968 | |
| 3616154 | Dow et al. | Oct 1971 | |
| 3678558 | Fredericks | Jul 1972 | |
| 3696578 | Swensen et al. | Oct 1972 | |
| 3774358 | Hale | Nov 1973 | |
| 4035536 | Morrison | Jul 1977 | |
| 4067156 | Downing | Jan 1978 | |
| 4397902 | Resch | Aug 1983 | |
| 4411121 | Blacklin et al. | Oct 1983 | |
| 4596095 | Chalfant | Jun 1986 | 
| Entry | 
|---|
| "Mathematical Models", by H. Martyn Cundy et al (1957), pp. 54-59. | 
| "Space Grid Structures", by John Borrego (1968), pp. 38, 42-43, 131-136, 156-157, 160-163, 194-197. |