Concept, Design and Patent Crated By Sanchayan Ghosh Sweeping Machine Patent Application No: 202021004902 https://www.youtube.com/watch?v=1LMa0JfTEOg iLock (Application No:202021016793) https://www.youtube.com/watch?v=8aK4oNo_Q4o Electro Mechanical Stethoscope (Patent Application Number:202021004068) https://www.youtube.com/watch?v=YAZ5oqKO1oI