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1975-10-31
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1977-09-27
Method of welding plastic seams
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1979-04-19
Method and device for connecting molded bodies made of polytetrafluoroethylene
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1991-12-27
Device for bonding tubular plastic parts
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1960-01-13
Improvements in or relating to electrically heated thermoplastic tube welding apparatus
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1996-02-28
Manufacturing method of joinery made of PVC, and seal therefor
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1995-07-12
Method for welding tubular members
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2000-08-17
Butt welding of plastic pipes, eliminating internal bulge and bead using internal expansible heating tire, improves pipeline properties and has special application for sheathing of gas-insulated high voltage cables
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1970-09-09
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1900-01-01
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DEVICE FOR WELDING TUBE ELEMENTS FROM THERMOPLAST