769-3123: Used for soldering cans and boxes, transformer casings, heat exchangers and radiators
769-3132 and 769-3135: Heavy maintenance work, electronic motors with high temperature alloys, radiator manufacture, large metal boxes and busbar joining
769-3126: General soldering on transformer casings, soldering on commutators up to 2in dia, tin plate and metal box fabrications
769-3129: Used mainly with higher temperature alloys on commutators