Vacuum Cleaners Vacuum-Cleaned (Jul, 1940)

This is so meta.

Vacuum Cleaners Vacuum-Cleaned
Because housewives generally hate to clean out vacuum-cleaner dust bags thoroughly, a Minneapolis, Minn., electrical shop does the job for them with a homemade machine. The bags are cleaned by a revolving brush set in an opening in a horizontal pipe, through which loosened dust is drawn off by a suction pump.

Related posts:

1. Beautifully Sucked (Sep, 1932)
2. Vacuum Cleaner Does Wash (Dec, 1951)
3. Build a Blow Torch from a Vacuum Sweeper (Jan, 1932)
4. Vacuum Tubes and Alloys Bring Back the Harpsichord (Aug, 1938)
5. BISSELL’S Carpet Sweeper (Apr, 1916)