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No single individual or even group of individuals invented C4, it evolved in a series of changes and improvements due to changing military requirements and operational conditions over time.

C4 was a reformulation of C3 which was a reformulation of C2 which was a reformulation of C1 which was developed during World War 2 as an improvement on the Composition B and Composition A explosives that the US Military was then using. Note: C1 through C4 are Composition C explosives. All three (Composition A, Composition B, and Composition C) explosives have numbered revisions, C4 is just the 4th revision of the basic Composition C formula.

The original US Composition A formula was adapted from a British formula for plastique explosive, which was then being supplied to the French resistance (thus the spelling "plastique").

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8y ago

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