Device for use in the manufacture of spigot and socket pipes of concrete having pre-tensioned reinforcements

797,682. Moulding concrete socketed pipes. AKTIEBOLAGET TRYCKRÍR. June 15, 1955, No. 17251/55. Class 87(2). A concrete pipe moulding device in which an expansible sleeve surrounds a rigid core in an expansible outer casing is adapted to mould the internal socket surface of the pipe by a second expan...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	HASSELBLAD ERIK DAVID VALTER
Format:	Patent
Sprache:	eng
Schlagworte:	PERFORMING OPERATIONS SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER TRANSPORTING WORKING CEMENT, CLAY, OR STONE
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