Anyone know of a source for seamless internal pipe connectors for…

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https://www.pinterest.com/pin/57772807709140916/
Anyone know of a source for seamless internal pipe connectors for copper pipe?

For example, something like this:

https://www.simplifiedbuilding.com/pipe-fittings/kee-klamp/18-internal-coupling

But designed for copper pipe instead of galvanized pipe. I want to make copper pipe furniture like this:
https://www.pinterest.com/pin/57772807709140916/

...but with more aesthetic joints.