When were the Db piccolo and the Eb horn phased out of the wind band?

Question

In many classic wind band pieces, there are parts written for Db piccolo and Eb horn. I imagine these were more common in the genesis of the military band, but now Db piccolo is all but unheard of, and you'd be hard-pressed to find a horn in Eb. (There is a cousin of the baritone horn called the alto horn which is pitched in Eb, but I am fairly certain this is not what is being referred to.)

When did wind band instrumentation make this transition?

Is this standard outside the US? Are there wind bands in other countries that do still use either of these instruments?

Answer 1

"In band music, the Db piccolo, rather than the larger orchestral C piccolo, was the mainstay until the early 20th Century, when the Db parts were gradually transposed for the C piccolo because of its stronger tone."

Source: http://kjt.glis.net/tealflutestudio/PiccoloEbTenor.html

Wikipedia might help a little on the Eb horn, but I don't have time to read this all at the moment:
- http://en.wikipedia.org/wiki/Horn_(instrument)#History