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G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Tragvorrichtung fuer Gruppen von elektrischen Gluehlampen, bei welcher das Fassungsgewinde aus einem schraubenfoermig gewundenen federnden Metalldraht besteht