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47
Yes, and no. A 2003 survey paper "Sonic Boom Research: History and Future" by Plotkin and Maglieri says they were predicted by Mach in the 1870s, were known as "ballistic waves" when caused by artillery shells. (See also this and this, which have some historical references, but none obviously connected with Yeager's flight. They do cite a seminal 1946 ...
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