Alton Lloyd Brand. Appl. states copyright is not claimed on the Mechanical features involved.
Simplex fingering slide rule for basses and Sousaphones.
R598249. Simplex fingering slide rule for basses and Sousaphones. By Alton Lloyd Brand. Appl. states copyright is not claimed on the Mechanical features involved. © 5Jun47; AA54589. Alton Lloyd Brand (A); 24Feb75; R598249.
Alton Lloyd Brand|A