Any ideas?

[MackDigger]

 

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[Charlie P. (NY)]

Flattened vacuum cleaner hose coupling (?)

 

[MackDigger]

I see what your saying but were they ever made of copper? That’s what this appears to be.

 

[MackDigger]

Or brass

 

[nhbenz]

I’d bet many were (with a pretty chrome finish). It does seem like something for adjusting the air intake, the way the wand tube would have. Similar idea on various types of burners.