Which famous military manufacturer conducted the first documented battlefield 'market research' during the American Revolution, testing musket prototypes with soldiers before mass production?

Before modern military technology, there was a time when armies had to make critical decisions about which weapons to mass produce based on primitive forms of market research. During the American Revolutionary War, one European manufacturer conducted what many historians consider the first formal field test of military equipment. This poll explores that fascinating intersection of military history and early product research.

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Charleville Armory of France
Brown Bess Workshop of Britain
Prussian Royal Arsenal
Dutch East India Company Armory