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Republic XP-47 Thunderbolt made first flight. May-June: First satisfactory spark plugs (ceramic insulated) for high-performance U.S. aircraft engines such as the P&W R-2800 were ordered in mass quantities. Plugs were developed under direction of T. T. Neill, Air Corps ignition engineer at Wright Field.

... 1941 30 May 1941 May May 1 1941 1 May 2 1941 2 May 3 1941 3 May 4 1941 4 May 5 1941 5 May 6 1941 6 May 7 1941 7 May 8 1941 8 May 9 1941 9 May 10 1941 10 May 11 1941 11 May 12 1941 12 May 13 1941 13 May 14 1941 14 May 15 1941 15 May ...

... such studies since the 1930s when it began operating a 15ft spin tunnel, enlarged in 1941 to 20ft and used since then in testing more than 400 aircraft designs; this was ... April May 1977 May May 1 1977 1 May 2 1977 2 May 3 1977 3 May 4 1977 4 May 5 1977 5 May 6 1977 6 May 7 1977 7 May 8 1977 8 May 9 1977 9 May 10 1977 10 May ...

... appointed Deputy Associate Administrator for Aeronautics in 1967. He had first joined ARC staff in 1941. ''(NASA Releases 70-72, 70-105)'' Mutual assistance agreement between Army Missile Command and Marshall ... Text)'' May 1970 May May 1 1970 1 May 2 1970 2 May 3 1970 3 May 4 1970 4 May 5 1970 5 May 6 1970 6 May 7 1970 7 May 8 1970 8 May 9 1970 9 May 10 ...

... .2-Inch mortar-fired bomb which became first USN rocket placed into fleet action in May 1942. First successful U.S. jet-assisted takeoff accomplished in an Ercoupe at March Field ...

... , A5)'' May 1969 May May 1 1969 1 May 2 1969 2 May 3 1969 3 May 4 1969 4 May 5 1969 5 May 6 1969 6 May 7 1969 7 May 8 1969 8 May 9 1969 9 May 10 1969 10 May 11 1969 11 May 12 1969 12 May 13 1969 13 May 14 1969 14 May 15 1969 15 May 16 1969 16 May 17 1969 17 May 18 1969 18 May 19 1969 19 May ...

... , 3)'' May 1969 May May 1 1969 1 May 2 1969 2 May 3 1969 3 May 4 1969 4 May 5 1969 5 May 6 1969 6 May 7 1969 7 May 8 1969 8 May 9 1969 9 May 10 1969 10 May 11 1969 11 May 12 1969 12 May 13 1969 13 May 14 1969 14 May 15 1969 15 May 16 1969 16 May 17 1969 17 May 18 1969 18 May 19 1969 19 May ...

... April May 1973 May May 1 1973 1 May 2 1973 2 May 3 1973 3 May 4 1973 4 May 5 1973 5 May 6 1973 6 May 7 1973 7 May 8 1973 8 May 9 1973 9 May 10 1973 10 May 11 1973 11 May 12 1973 12 May 13 1973 13 May 14 1973 14 May 15 1973 15 May 16 1973 16 May 17 1973 17 May 18 1973 18 May 19 1973 19 May ...

... , May 2/91) April 1991 April May 1991 May May 1 1991 1 May 2 1991 2 May 3 1991 3 May 4 1991 4 May 5 1991 5 May 6 1991 6 May 7 1991 7 May 8 1991 8 May 9 1991 9 May 10 1991 10 May ...

... April May 1991 May May 1 1991 1 May 2 1991 2 May 3 1991 3 May 4 1991 4 May 5 1991 5 May 6 1991 6 May 7 1991 7 May 8 1991 8 May 9 1991 9 May 10 1991 10 May 11 1991 11 May 12 1991 12 May 13 1991 13 May 14 1991 14 May 15 1991 15 May 16 1991 16 May 17 1991 17 May 18 1991 18 May 19 1991 19 May ...

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