Assertion: sounding board's end | /r/HasAspect | two usable membranes
Facets:
Source sentences:
text: 211.211.2 Instruments in which the end without a membrane is closed 211.212 Instruments which have two usable membranes 211.212.1 Single instruments
text: 211.231.2 Instruments in which the end without a membrane is closed 211.232 Instruments which have two usable membranes 211.232.1 Single instruments 211.232.2 Sets of instruments 211.223 Mixed sets of hourglass drums 211.24 Instruments in which the body is conical-shaped (conical drums)
text: 211.244.12 Instruments in which the end without a membrane is closed 211.244.2 Instruments which have two usable membranes 211.244.21