| 1. | Welding transformers for portable spot welding machines
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| 2. | Safety requirements for portable arc welding transformers
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| 3. | Safety requirements for the portable arc welding transformer
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| 4. | Arc welding transformer hazard reducing device
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| 5. | Resistance welding transformers ; suspension type , dimensions , characteristics
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| 6. | Arc welding transformer
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| 7. | Resistance welding transformers ; transformers with flanged joints ; dimensions , characteristics
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| 8. | Appliance coupling for the primary connection of resistance welding transformers , 200 a 550 v
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