The Collaborative International Dictionary of English v.0.48:

Kent bugle \Kent" bu"gle\prop. n. [Probably named after a Duke
   of Kent.] (Mus.)
   A curved bugle, having six finger keys or stops, by means of
   which the performer can play upon every key in the musical
   scale; -- called also keyed bugle, and key bugle.
   --Moore.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Keyed \Keyed\ (k[=e]d), a.
   Furnished with keys; as, a keyed instrument; also, set to a
   key, as a tune.
   [1913 Webster]

   Keyed bugle. See Kent bugle.
      [1913 Webster]