[GreenKeys] Clutch design for Model 28 family?

[John Nagle]

This little demo model of a "code bar clutch" is on Ebay:

http://www.ebay.com/itm/CODE-BAR-CLUTCH-Salesman-Sample-Display-mechanism-teletype-/221807200310

Is that a Model 28 family part?

One of the claimed advantages of the Model 28 line was that the
oiled felt slip clutches of the older machines had been replaced with
a metal-to-metal clutch.  Is this it?

			John Nagle