https://youtu.be/AvjTY5-TuN8
https://m.youtube.com/watch?v=3r-wRhMl5uk
1992- the patent for curved blades for reciprocating saws is granted
https://youtu.be/3wL66fySI7Q
https://m.youtube.com/watch?v=DwKHJo1TBtE
https://m.youtube.com/watch?v=DmlfCoy2Mpk
https://youtube.com/watch?v=5eDGbZmTch4&feature=share
https://youtu.be/2VOTZVa9VZI
https://youtu.be/zGD46RT5_sw
https://youtu.be/vfIk9pSNeGQ