Patents Assigned to Slingerland Drum Co.
  • Marching timpani
    Patent number: 4122749
    Abstract: A machine-tuning marching timpani having an adjusting apparatus arranged in a thin, generally planar configuration permitting the elimination of the conventional deep shell portion of such timpani.
    Type: Grant
    Filed: March 2, 1977
    Date of Patent: October 31, 1978
    Assignee: Slingerland Drum Co.
    Inventor: John L. Hoellerich