| 1130324 | March, 1915 | Owen | 446/127 | |
| 1245440 | November, 1917 | Converse | 446/127 | |
| 1898297 | Building blocks | February, 1933 | Fox | 446/127 |
| 3005282 | Toy building brick | October, 1961 | Christiansen | 446/125 |
| 3242610 | Flexible connector for toy construction sets | March, 1966 | Christiansen | 446/126 |
| 3513588 | TOY ASSEMBLY KIT | May, 1970 | Fischer | 446/127 |
| 4740189 | Construction toy assembly | April, 1988 | Bertrand | 446/128 |
| 4744780 | Adapter block | May, 1988 | Volpe | 446/128 |
FIG. 1 is a top plan view of a toy construction block with symmetrically arranged T-slots showing my new design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a front side view thereof, the rear and left and right side views thereof being identical; and,
FIG. 4 is a cross-sectional view thereof taken at cut line 4--4.