| 1477665 | Concrete building | |||
| 1571849 | Method of making building blocks | |||
| 1844497 | Tile silo | |||
| 1959773 | Burial vault | |||
| 1985328 | Building unit and structure | |||
| 2014778 | Building slab | |||
| 2037545 | Manufacture of concrete blocks and the like | |||
| 2046213 | Monolithic, metallic-reenforced slab | |||
| 2078144 | Precast concrete unit system for wall construction | |||
| 2270846 | Building construction | |||
| 2518640 | Insulated building block | |||
| 2590685 | Prestressed concrete structure |
| GB190604971A | ||||
| FR571872A | ||||
| CH191782A | ||||
| DE901467C | ||||
| FR1086562A |