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There's two kinds of boomerang, the one to try to hit something with has a different shape and goes in a straight line without returning. It indeed might be a clever alternative to a grenade, made of explosives in a thin metal shell because one person could throw more explosive mass further than a person could throw a grenade.

Someone submitted the design during WWI but it wasn’t used: https://www.southernhighlandnews.com.au/story/2992498/boomer...

Seems like with drones becoming so common, this invention just doesn’t make much sense anymore.

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