What is Key? & Types of keys.(in hindi) 

✔Hello, everyone in this video I explain about "what is Key? & Types of keys".
The main topics which I explain in this video are:
(1) what is Key
(2) Types of keys
(a) Sunk key
(b) Saddle key
(c) Tangent key
(d) Round key
(e) Splines
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