Any idea of what this was used for...

[leadnbrass]

 

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[creskol]

Looks like an older chemistry beaker stand.

 

[smokeythecat]

Yes, Chemistry beaker/test tub holder. Probably 1940ish. My dad had one and I used to play with it all the time when i was younger.

 

[gtkwml]

It held one of these:
Separatory funnel - Wikipedia, the free encyclopedia