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"K.V.W.S." in Wheatstone Ledgers


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Key  Valve  and  Wrist  Straps.   


Prior to  the  air  button  being  operated  by  a  "Key"  there  was  a " Slide Valve"   a  lever  that  the  thumb  actuated  with  a  sideways  movement  (S.V.)  .   



Edited by Geoff Wooff
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