Is there a database that I can type in a NSN and find out who owns the data rights (government or contractor)?
Is there a database that contains the part drawings and technical data required to procure parts that can be searched by NSN?
The best place to find this information is the Defense Logistics Agency. There is a site where you can view the technical data on a given NSN. It is in the C-Folder. Try https://www.dibbs.bsm.dla.mil/ you may need to set up an account to have complete access. The phone number is 804 279 3477 they should be able to help you locate the information you are looking for.
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Feel free to call me and we can discuss in more detail. Ed Eden 309 782 6808 DSN 973 6808