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2
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3द्वारा Teago, Frederick Jerroldविषय: “...Electric current rectifiers Electric arc...”
प्रकाशित 1936
Printed Book -
4द्वारा Parkin, Nविषय: “...Oxy - Acetylene gascwelding Electric Arc welding...”
प्रकाशित 1969
Printed Book