Assertion: button accordion | /r/HasProperty | constructed by nikolai i. belobodorev
Facets:
value: in 1870
type: TEMPORAL
Source sentences:
text: The first chromatic button accordion may have been constructed as early as 1850 by Franz Walther, in 1870 by Nikolai I. Belobodorev, or as late as 1891 by Georg Mirwald.