[pianotech] can anyone identify this hardware?

[Mark Potter]

>From an 1884 Vose & Sons upright.  Attaches under the keybed - one at each end 
(see closed position photo) .  Each pivots outward to extend beyond keybed (open 
position photo).  Does anyone know what purpose these serve?  I can't conjure up 
a decent guess...

Mark Potter
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