Alton Lloyd Brand. Appl. states copyright is not claimed on the mechanical features involved.
Simplex fingering slide rule for baritone and euphonium.
R598248. Simplex fingering slide rule for baritone and euphonium. By Alton Lloyd Brand. Appl. states copyright is not claimed on the mechanical features involved. © 5Jun47; AA54588. Alton Lloyd Brand (A); 24Feb75; R598248.
Alton Lloyd Brand|A