Answers

2016-04-30T12:34:33+05:30
Prafulla Chandra Ray:
 he founded the chemical manufacture company ''Bengal Chemicals and Pharmaceuticals Works Ltd.''

Archimedes:
Archimedes’ Screw

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2016-04-30T12:42:44+05:30
Alexander graham bell -----------telephone

Hans Lippershey---------------------- telescope
 
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