It was found in a yard sale, and is jerky in spots from torn sprocket holes, but definitely worth a look for SP&S Ventilators.
Part 1, 12 minutes
[youtube]http://youtu.be/ysftVhAEJnc[/youtube]
Part 2, 12:30 minutes
[youtube]http://youtu.be/8U4-CvMZ-VU[/youtube]
Part 3, 12 minutes