USAAF contract numbers - can anyone date this contract?

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2nd Lieutenant
Sep 19, 2012
Aw flaming stalia
I am trying to date a Curtiss drop tank part number 75-45-433-50 contract W535 AC15802.

Somewhere there must be a list of contract numbers and the date that each contract was issued, and even copies including changes (revisions).

If anyone can provide me a link to such data it would be most appreciated.

Many thanks. Not the response I wanted as I had hoped the fuel drop tanks were a separate contract but still a very interesting document.

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