When did the first rainbow vacuum come out?
No context provided
When did the first vacuum officially called the rainbow come out?
1955
No context provided
When did the first Rexair LLC vacuum that would evolved into the rainbow vacuum come out?
1936
Rexair
https://en.wikipedia.org/wiki/Rexair
The first Rexair LLC vacuum came out in 1936, which would evolve into the Rainbow vacuum. The first officially named Rainbow vacuum came out in 1955.