Who is the inventor of trombone?

While the exact inventor of the trombone is unknown, credit for its original design is believed to be shared between several musical instrument makers in the 15th century and their contributions include:

Christian Gottfried Schierlinger invented the sackbut's slide in Nuremberg circa 1694.

Michael Praetorius wrote Syntagma Musicum and mentioned instruments similar to trombones already existing in 1619