With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Julius Caesar swam the Rubicon in 49 BC.
text_B: ESL Incorporated , or Electromagnetic Systems Laboratory , was a subsidiary of TRW , a high technology firm in the United States that was engaged in software design , systems analysis and hardware development for the strategic reconnaissance marketplace .. subsidiary. subsidiary. TRW. TRW Inc.. United States. United States. Founded in January , 1964 in Palo Alto , California , the company was initially entirely privately capitalized by its employees .. One of the company founders and original chief executive was William J. Perry , who eventually became United States Secretary of Defense under President Bill Clinton .. United States. United States. William J. Perry. William J. Perry. United States Secretary of Defense. United States Secretary of Defense. Bill Clinton. Bill Clinton. Another company founder was Joe Edwin Armstrong ESL was a leader in developing strategic signal processing systems and a prominent supplier of tactical reconnaissance and direction-finding systems to the U. S. military .. These systems provided integrated real-time intelligence .. Most of TRW - including ESL - was acquired by the Northrop Grumman Corporation in December 2002 .. TRW. TRW Inc.. Northrop Grumman Corporation. Northrop Grumman Corporation. ESL primarily supplied domestic intelligence agencies , NASA and the U.S. military , but had certain direct relations with the North Atlantic Treaty Organization -LRB- NATO -RRB- and also provided some services for a variety of state agencies .. NASA. NASA. North Atlantic Treaty Organization. North Atlantic Treaty Organization. Principal historic areas of competence are  : -LRB- a -RRB- reconnaissance systems ; -LRB- b -RRB- data communications systems -LRB- including advanced sonar and laser light scattering -RRB- ; -LRB- c -RRB- phased array radar surveillance systems ; -LRB- d -RRB- advanced data processing systems ; and -LRB- e -RRB- environmental systems .. phased array. phased array. The company employed a large technical staff , most of them holding advanced academic degrees .
not_related.