In 1973, Ann Margaret Zaleski patented a dog-shaped vacuum cleaner. Why? From the abstract:
A toy dog closely resembling a real dog and having a hollow interior in which is mounted a vacuum cleaner having a suction hose which is retractable from the tail end of the dog. This enables vacuuming a dog after a haircut and grooming without causing fear to the dog, inasmuch as the vacuum cleaner noise is greatly muffled by such an enclosure.
Link via Technabob | Image: USPO
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Ann Margaret was right: this wouldn't freak out your dog at all. Just like finding out my dentist has his drill and suction thingy built into his chest cavity wouldn't freak me out while lying there.
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