I believe that most of the shipyards you have listed do indeed fall under the N-G umbrella, owing to decades of mergers and corporate takeovers.
It's really a sad situation.
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Personally speaking, the P-40 could contend on an equal footing with all the types of Messerschmitts, almost to the end of 1943.
~Nikolay Gerasimovitch Golodnikov
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