51414 ⎘
General aspects of processes or apparatus for joining preformed parts; General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces; Joining substantially flat articles ; Making flat seams in tubular or hollow articles; Joining a relatively small portion of the surface of said articles; Joining substantially flat articles for forming corner connections, fork connections or cross connections Joining substantially flat articles for forming cross connections, e.g. for making X-shaped pieces
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