Is there an equivalent to Silent Gliss curtain poles

[voluptuagoodshag]

They seem to be the only ones I can find but wondering if there are other similar types.
Fwiw they look like normal curtain poles but the eyelets sit in a groove so it's easier to open/close curtains, especially in a bay window.

Integra make some too.

So do Byron and Byron - IIRC, most of their poles can be corded.