US1648562A
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Electric-arc welding control method and means
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US1648563A
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Electric-arc welding apparatus
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US1620219A
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Arc-welding system
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US1826186A
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Metallic electrode arc welding
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US1648561A
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Apparatus for arc welding
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US1392436A
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Method of and apparatus for arc-welding
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US1392437A
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Arc-welding system and method of operating the same
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US1278985A
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Portable electric-arc-welding apparatus.
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US1278984A
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Method of and means for electric-arc welding.
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US1278983A
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Automatic arc-welding machine.
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US1278982A
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Control system for electric-arc-welding mechanism.
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US1648560A
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Electric-arc welding
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