▁M . ▁H erman , ▁Isaac ▁Newton ▁R ice ▁( 1 8 4 7 – 1 9 2 9 ), ▁and ▁Samuel ▁Ring g old ▁H uy ett ▁( 1 9 4 6 – 1 9 1 1 ). ▁ ▁In ▁ 1 8 9 2 , ▁the ▁Sch a ef fer ' s ▁piano ▁factory , ▁located ▁in ▁Oregon , ▁Illinois , ▁had ▁ 9 0 ▁employees ▁and ▁was ▁producing ▁ 2 0 ▁pian os ▁a ▁week . ▁▁ ▁Aff ili ations ▁▁ ▁National ▁P iano ▁Tra vel ers ▁Association , ▁E . R . ▁Jacob son , ▁et ▁al . ▁ ▁National ▁P iano ▁Man ufact ur ers ▁Association , ▁Stra ube ▁P iano ▁Co . ▁ ▁E . R . ▁Jacob son , ▁past ▁president ▁ ▁Hamm ond ▁Man ufact ur ers ▁Association ▁ ▁E . R . ▁Jacob son , ▁elected ▁president ▁ 1 9 2 5 ▁ ▁Chicago ▁P iano ▁& ▁Organ ▁Association ▁▁ ▁Selected ▁pat ents ▁ ▁In ▁the ▁mid ▁ 1 9 2 0 s , ▁Stra ube ▁P iano ▁had ▁some ▁pat ents ▁that ▁influenced ▁the ▁industry . ▁In ▁ 1 9 2 6 , ▁Stra ube ▁introduced ▁its ▁pat ented ▁Du plex ▁Over string ing ▁system ▁– ▁US ▁Pat ent ▁No . ▁ 1 7 6 9 2 8 4 ▁– ▁claim ing ▁that ▁it ▁enabled ▁smaller ▁Stra ube ▁u pr ights ▁to ▁produce ▁the ▁sound ▁of ▁full ▁u pr ights ▁and ▁Stra ube ' s ▁smallest ▁grand , ▁the ▁Son ata ▁Grand ,