1961.
A large cannon fired at a high angle. See the related link to the M198 155mm towed howitzer and the M109A self propelled howitzer.
Lunokhod-1 was the first self-propelled vehicle on the moon.
There were 4 wheels on the first self propelled vehicle, built by Henry Ford.
self propelled reaper
russia
The first self-propelled aeroplane.
It was the first self-propelled machine that worked reliably.
Yes, the first self-propelled train was run in 1804.
By far the most common US howitzer was the 105mm split trail (towed piece). The most common SP (Self Propelled gun) was the 155mm SP. There were some SP 175mm, 8 inch SP, and 155mm split trails in use. Unless their tubes were wore out, they were all accurate.
An aircraft with an engine. A non-self propelled aircraft would be a balloon or a glider.
How do you change the blade on a Toro 21" self-propelled mower
Dyson makes several different models of self-propelled vacuums.