<HTML> I did a search for "piano action" and "repetition" on  the US Patent and Trademark Office site and found this patent, filed by Scott Jones and Stefan Knupfler, assignee Steinway, Inc., June 8, 1999: <BR>  <UL>"A knuckle assembly for an escapement action of a piano includes a knuckle, a jack retainer, and an adjustment means acting between the retainer and the knuckle for positioning the retainer relative to the knuckle. The knuckle assembly is mountable between first and second ends of a hammershank. The knuckle defines a knuckle surface for engagement with a jack. The knuckle is arranged for escape of the jack from engagement with the knuckle surface during depression of a piano key. The retainer retains the jack in an "at rest" position with the jack in engagement with the knuckle surface in opposition to force of a spring urging the jack toward the "at rest" position. A piano escapement action assembly includes a hammershank, a knuckle assembly, a jack engaged with a knuckle surface in an "at rest", and a spring disposed to urge the jack toward the "at rest" position."</UL> <P>I have in the shop an 1890's Broadwood Short Concert Grand with a less adjustable version of this very invention, also with Thayer-type knuckles. Does anyone know about the recent patent? <P>Clark <BR> </HTML>