About: http://webisa.webdatacommons.org/61850055

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	BACKGROUND OF THE INVENTION This invention relates to optical devices for surveying, rangefinding, and the like, and is particularly adaptable for telescopes and their use in aiming firearms.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com