Dr. Gordon Volkenant seems like he was quite the character. In 1947, he invented a gadget he called the "husband detector." It was basically a motion detector, designed to help wives catch their husbands who were trying to sneak unheard into the house after a late night at the bar. When it sensed someone coming through the door, it set off a loud siren. link: Pittsburgh Press
Volkenant promptly became the first husband to be caught by his own device, when it rang the alarm as he tried to sneak into his house at 3 a.m. link: Washington Reporter
And based on the look of him, I'm guessing he wasn't just at the bar until 3 a.m. Here he is in 1948 demonstrating another of his gadgets, which he called an "electronic humidistat." He claimed it could detect hosiery defects in nylon stockings when he waved it up and down a woman's leg. It looks a lot like a regular lightbulb to me. I'm sure he found it necessary to test on many women.
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I came across this description of a mechanical hair-brush published in Chambers's Journal of Popular Literature, Nov. 23, 1863. It operated by means of "an endless band of vulcanised india-rubber... that descends to within about a foot of your head and is made to revolve by machinery." Here's a description of it in action:
When I went in to get my hair thus brushed, had sat down before the glass, and been tucked in as usual, with bib and dressing-gown, the hair-dresser took up one of his circular brushes and hitched it to the revolving band over my head. In a moment I felt a silent fanning, as if some monstrous butterfly were hovering over me; this was the air of the twirling brush, which caught my hair up and laid it down, and traveled all over my head with incessant gentle penetration. It crept down my whiskers and searched my beard with the same tender and yet decided effect. There was no scratching, not even of the neck and ears, but the skin of cheeks and chin was reached and swept. It was a new sensation. I felt as if I should like to be brush continously for a month.
Evidently mechanical hair-brushes never caught on, because the only picture of one I could find was this:
Category: Inventions, Lies, Dishonesty and Cheating, Husbands