Assertion: sextant | /r/HasProperty | developed in the middle of the 20th century
Facets:
Source sentences:
text: A sextant was developed in the middle of the 20th century that featured an automatic level or plumb bob (a gyroscopic pendulum).
text: A sextant was developed in the middle of the 20th century that featured an automatic level or plumb bob (a gyroscopic pendulum).