To the right is an illustrated schematic animation that contains
a three phase motor starter with dual start stop buttons.
Add as many stop buttons as you like, stop buttons must be normally closed contacts and are in series from one to the next.
Add as many start buttons as you like, start buttons are normally open and are parallel, there is no limit to how many you can add.
Either start button will complete the path to the coil, this will close the MS1 contact maintaining the path to the coil.
Either stop button will break the path to the coil.