Help Identifying parts

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I ordered a bunch of grab bags so that I could replenish my inventory in the workshop.

Most, I can identify but there are some that I have little or no idea what they are or just want to know a bit more about.

here are the first set of pictures.
I'm assuming these are some sort of narrow band RF filters? They are sort of heavy, feels like a sort of solid chunk of metal/ceramic.
 

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We like caps, so here are some found along in the pile.

I can identify the Wimas, the others all I know are just caps. If they are any good for audio projects, would be nice. :)

The white Rifa ones are interesting. They appear to be low tolerance parts as the value marking suggests.
 

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The blue circular component among your capacitors is a varistor. FYI.

thanks! for some reason, the numbering made me think it was a high voltage capacitor of some sort. :)

here's more, The Fujitsu brand IC (lower right) is described to be a dual op amp but no datasheet found yet. I think the top left device is a DIP packaged crystal without an internal oscillator?

The others, no idea.
 

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