|
US1979626A
|
|
Means for manufacturing hollow building blocks, tiles, and bricks
|
|
US1860584A
|
|
Method of and means for closing the ends of the channels of molded hollow channel bricks and building blocks
|
|
GB352306A
|
|
Improvements in and relating to methods of and means for the closing up of the open ends of the channels of hollow-channel bricks and building blocks
|
|
GB337231A
|
|
A process for manufacturing bricks
|
|
GB325081A
|
|
Improved method of and means for producing bricks of loam, clay and like material provided with excavations
|
