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SPRENGLUFT GmbH
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SPRENGLUFT GmbH
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Application filed by SPRENGLUFT GmbHfiledCriticalSPRENGLUFT GmbH
Application grantedgrantedCritical
Publication of FR525909ApublicationCriticalpatent/FR525909A/fr
B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
B21C37/15—Making tubes of special shape; Making tube fittings
B21C37/151—Making tubes with multiple passages
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Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
FR525909A1918-11-011920-07-10Contre-rail isolé pour la signalisation électrique sur les voies ferrées
ExpiredFR525909A
(fr)