A related site is Burch Popcorn Machine. Although not as complete as
this site, its goal is the same. Burch Manufacturing Company was the name
used until Manley changed its name in 1940.
The following is a trailer that show a Manley Vista-Pop making popcorn.
This is obviously produced by Manley, Inc. The other clips show Manley
machines, but were probably not produced by Manley.
The following is called "Pop Goes the Whistle". You can clearly see
the Manley Popcorn Boxes in the Ad.
Here is one called "Popcorn Magic" from 1960. You can clearly see a
Manley Vista Pop Popcorn machine used for the Popcorn: