| 摘要 |
The present invention concerns improvements in hollow building blocks, such as cement or cinder blocks and a method for assembling same. The hollow blocks of the present invention have a male tongue at one end, a groove for receiving the tongue at the opposite end, and an intermediate offset transverse web of a thickness slightly exceeding the depth of a groove. In assembly, the blocks of each course are arranged with tongues reversed from those of lower course and with each joint situated over the web of a lower block.
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