"The heckelphone (German: Heckelphon) is a musical instrument invented by Wilhelm Heckel and his sons. The idea to create the instrument was initiated by Richard Wagner, ...
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who suggested at the occasion of a visit of Wilhelm Heckel in 1879. Introduced in 1904, it is similar to the oboe but pitched an octave lower." - (en.wikipedia.org 01.12.2019)
