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First Anglo Maratha War
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Abhishek Srivastava is teaching live on Unacademy Plus

Abhishek Srivastava
GS faculty and subject matter expert | 4 yrs Teaching Exp.| HiStory, Geog. and Polity courses with interrelation, logic & chronology.

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VJ
why laser beam machining is not done in vacuum and if we do LBM in vacuum then what happens?? and also why Electron beam machining is done in vacuum and if we do in open atmosphere like LBM then what happens?