| 1971545 | Toy building block | August, 1934 | Tompkins | 446/121 |
| 2861388 | Structural toy and model building set | November, 1958 | Favaretto | 446/124 |
| 3162973 | Toy building element | December, 1964 | Christiansen | |
| 3220141 | Building blocks connectable in slideable or non-slideable relationship | November, 1965 | Goss, III | |
| 3412502 | Hollow reinforced nestable building block | November, 1968 | Riches | |
| 3487579 | BLOCKS INCLUDING MEANS FOR INTERLOCKING THEM AT PLURAL ANGLES | January, 1970 | Brettingen | |
| 3877170 | Construction toy element | April, 1975 | Bakker | |
| 4246718 | Interconnecting toy block arrangement | January, 1981 | Chatani | |
| 4305221 | Block of members having interior interlock means | December, 1981 | Chatani | |
| 4306373 | Interconnecting toy block arrangement | December, 1981 | Chatani et al. | |
| 5230195 | Insulating molded plastic building unit | July, 1993 | Sease | 525/926 |
| 5683283 | Construction blocks for extended support structures | November, 1997 | Glynn |
| AU229861 | April, 1958 | |||
| EP0039100 | April, 1980 | Compound brick for a constructional toy. | ||
| FR1150976 | May, 1956 | |||
| FR1180316 | June, 1957 | |||
| DE2429491 | January, 1975 | |||
| GB935308 | June, 1961 | |||
| GB1049484 | September, 1963 |
FIG. 1 is a top perspective view of treble stud construction toy block according to the invention;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a side elevational view thereof, the opposite side elevational view thereof being identical; and,
FIG. 6 is an end elevational view thereof, the opposite end elevational view thereof being identical.