Assertion: telescope eyepiece | /r/HasProperty | developed in early 1600s
Facets:
value: by christian huygens
type: OTHER
Source sentences:
text: Huygenian telescope eyepieces were developed in the early 1600s by Christian Huygens.
text: Huygenian telescope eyepieces were the first of their kind, developed in the early 1600s by Christian Huygens.