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How do these compare to the IPC standards? Redundant?

It depends on the program manager, but in many cases if you meet the IPC standards they are considered equivalent.

Kinda similar to meeting ISO or AS standards. When in doubt, you default to whatever the spec in the drawing states

Hmm I have no idea! Are the IPC standards publicly available for me to check out?

Yes but the book isn't free. IPC-A-610 is a good place to start. I just briefly browsed the page but it seems to be very close to IPC standards with the J-Standard addition (which is mission critical/Space typically)

Source: I was IPC trained for QA/technician at one point (as well as soldering and assembly)

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