▁full ▁extension ▁music ▁des k , ▁new ▁grand ▁scale ▁with ▁cap o ▁D ' A st ro ▁bearing ▁bar ▁on ▁bass ▁section , ▁nick el ▁pl ated ▁tun ing ▁p ins , ▁br ass ▁strings ▁wrapped ▁with ▁co pper , ▁pat ent ▁improved ▁double ▁repeating ▁action ▁with ▁br ass ▁cap stan ▁reg ulating ▁sc rew s ▁in ▁keys , ▁b ushed ▁tun ing ▁p ins , ▁nick el ▁pl ated ▁ham mer ▁rail , ▁continuous ▁h ing es , ▁improved ▁double ▁roll ▁fall ▁board , ▁iv ory ▁keys ▁and ▁pat ent ▁no is eless ▁ped als . ▁It ▁is ▁ 4 ▁feet ▁ 8 ▁inches ▁in ▁height ▁ ▁Style ▁S ▁– ▁similar ▁to ▁the ▁Style ▁O ▁ ▁Style ▁F ▁( int rodu ced ▁on ▁or ▁before ▁ 1 9 2 5 ) ▁ ▁Style ▁G ▁( int rodu ced ▁on ▁or ▁before ▁ 1 9 2 5 ) ▁ ▁Style ▁H ▁( int rodu ced ▁on ▁or ▁before ▁ 1 9 2 5 ) ▁▁ ▁Hamm ond ▁models ▁▁▁ ▁Play ers ▁ ▁Hamm ond ▁Style ▁ 1 0 ▁( 1 9 1 4 ), ▁made ▁of ▁ma h og any ▁& ▁o ak ▁ ▁The ▁Ar tr on ome ▁player ▁action , ▁introduced ▁on ▁Stra ube ▁player ▁pian os ▁in ▁May ▁ 1 9 2 1 , ▁included ▁pat ented ▁p end ul um ▁val ves , ▁one ▁for ▁each ▁note , ▁a ▁ten point ▁custom ized ▁motor , ▁and ▁an ▁automatic ▁ball - b ear ing ▁roll ▁adjust er ▁for ▁the ▁tracking