  The electron and the proton have a negative electrostatic charge and a positive electrostatic charge respectively. Each charge-and the force associated with that unit of charge-is constant-and equal.(The electron and proton have equal, but oppositely polarized, electrostatic charges.) But there is more. The electron and the proton have a negative electrostatic charge and a positive electrostatic charge respectively. Each charge-and the force associated with that unit of charge-is constant-and equal.
The start of life for the tank did not bode well. The first model came off the factory floor on September 8th 1915. On September 10th, its track came off. The same happened on September 19th when government officials were watching.
Today's anti-tank MISSILES like the SAGGERs and TOWs were FIRST used in Vietnam. Pattons and PT76 tanks were amongst the first victims of those two missiles during the Easter Offensive in South Vietnam in 1972.  The M60 was America's FIRST MBT (Main Battle Tank) and was fielded in 1960 as the M60 Combat Tank.