Assertion: tape recorder's head | /r/HasAspect | square magnetic particles
Facets:
value: on them
type: LOCATION
Source sentences:
text: So the resulting recorder that uses the unusual circular head and tape that has square magnetic particles on them (BASF tapes used isotopic shaped particles) was really only usable for voice recording since it only had a frequency response of around 200 Hz to 5 kHz while by comparison a WWII era