| 摘要 |
The invention relates to a combination of two factory-built forms consisting of two form panels set within sectional steel frames having longitudinal channels with flanks forming an acute angle to each other and having outer flanges and ribs; in the locked and tightened state the ribs are in contact with each other; the combination also consists of a form lock device which forces the steel frames tightly against each other and brings the outer flanges into alignment.
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