About: http://webisa.webdatacommons.org/409851203

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	The 30?? limitation is to prevent the worker from swinging too far in a pendulum motion where they might swing back and smash into a wall or other protruding hazard.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com