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On 13 March 1977, the prototype of the Sikorsky S-76 medium-size utility rotorcraft performed its first flight. The development of the S-76 helicopter began in the mid-1970s and, initially, the rotorcraft was known as the [...] -
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On 13 March 1977, the prototype of the Sikorsky S-76 medium-size utility rotorcraft performed its first flight. The development of the S-76 helicopter began in the mid-1970s and, initially, the rotorcraft was known as the [...]
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