The wartime one is the Chore Horse, made in Canada. Uses, they seem to have been everywhere. Mostly with signals vehicles of the Smaller type up to 15 cwt. The bigger 3 ton QL's carried either a built in generator or a larger auxilary on command vehicles. The BSA sets are mostly dated in the early 1950's, 53 seeming to be the most prolific. With the change to solid state radios they went out of use. Small but extremly heavy, the also use a rotary dynamo with a Boron rectifier, the dust is very poisionus, so another eson for them going out of use. During the war there were also battery trucks. These were loaded with a number of cells and were used as jump starters fro vehicles , or to carry replacement baterys, change the one on the vehicle then charge up later, these also had charging sets. Very versitile bit of kit.