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Swiss Army Helmet

The combination shovel, helmet, mess tin: wisely, the Army passed (Popular Mechanics, Feb. 1917).

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Biker Gear

Although motorcycles with sidecars continued to be developed in most armies right thought WW2, this moto-machine gun emplacement never caught on. Popular Mechanics, Feb. 1917.

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Tethered Helicopter

Austrian Stephan Petroczy built this  helicopter with three 120HP engines and counter-rotating props near the end of WW1; tethered like a balloon, it reached a height of 150 ft. The observers were carried in the drum mounted above the props (Popular Mechanics, June 1921, p. 828).

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Auto-Lavabo

The auto-lavabo has gone the way of automobile running boards. I think it was just a sink, really. For refreshing oneself.
(Popular Mechanics, June 1921).
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Snow Tow

Hardcore snowmobiling–towed behind a motorized sled with a spiked wheel! (Popular Mechanics, March 1917)

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Proto-Snowmobile

This New Hampshire rig has the classic configuration: engine in front supported by skis; tracked rear drive (Popular Mechanics, March 1917):

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Long Barrel of the Law

Sheriff Frank Barnet of Alameda Co. CA invented this cunning pistol barrel extension cum nightstick. Didn’t catch on! (Popular Mechanics, March 1917)

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Snow Chopper

This early snowmobile  looks very cozy. And scary at 25mph! (Popular Mechanics, April 1917)

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Flying Torpedo Tug

At first glance, this looks fine: a very small torpedo boat. Then the second half of the article reveals that the boat is actually a pontoon towed by an aircraft… (Popular Mechanics, July 1917)

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Ironman

Too heavy for infantry and awkward on uneven ground, these mobile personnel shields, designed by Col. Jean Baptiste Eugène Estienne (of FT-17 fame) were rarely used (Popular Mechanics, April 1917).

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