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Mach
1967 William Knight sets X-15 speed rec of 7,297 KPH/4,534 MPH/Mach 6.72

1959 USAF rocket-powered rail sled attains Mach 4.1 (4970 kph), New Mexico

1953 Chuck Yeager reaches Mach 2.43 in Bell X-1A rocket plane

1953 Scott Crossfield in Douglas Skyrocket, 1st to break Mach 2 (1,300 MPH)

1947 Chuck Yeager in Bell XS-1 makes 1st supersonic flight (Mach 1.015)

1916 Ernst Mach, Austrian physicist/philosopher/psychologist, dies at 78

1898 John Ames Sherman patents 1st envelope folding and gumming mach (Mass)

1895 Charles T Stork, great industrialist (cotton mach factory), dies at 73

1838 Ernst Mach, Chirlitz-Turas Austria, physicist/philosopher/psychologist



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