About: http://webisa.webdatacommons.org/430144844

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	Figure 10 shows a modification of the arrangements at the transmitting station, and figure 11 a modification of the arrangements of the receiving station, which enables one to signal through obstacles such as hills or mountains.
http://www.w3.org/ns/prov#wasQuotedFrom	earlyradiohistory.us