https://youtu.be/SnyMYhQfIB8
https://youtu.be/OHB8O6HnxkI
https://youtu.be/dNAHTd2CcKo
https://m.youtube.com/watch?v=xA6Ry3Ab7vU
https://m.youtube.com/watch?v=dQebMqteGFc
https://m.youtube.com/watch?v=Rxx0xZ6iVJ4
https://youtu.be/NOB_g5w_BkA
1970- the patent for the heat gun was published.
https://youtu.be/mxBXVLuLIyM
https://m.youtube.com/watch?v=h8fxDgKGHs0