Method of manufacturing heat-weldable thermoplastic fittings

Metal working – Method of mechanical manufacture – Electrical device making

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29423, 285 21, 219544, 26427218, 264163, 264278, 264334, 156294, H05B 358

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048255343

ABSTRACT:
Welding muffs for joining thermoplastic pipes are molded using a core in which are placed terminals supported by plastic posts which may be removable and/or frangible so that when the cores are withdrawn the plastic posts do not prevent withdrawal.

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patent: 4530521 (1985-07-01), Nyffeler
patent: 4622087 (1986-11-01), Ansell
patent: 4727242 (1988-02-01), Barfield

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