Question: Which company, with stock symbol BHGE, merged with Summa Corporation in 1987?

Context articles: P&amp;O Princess Cruises
Baker Hughes
International Automated Systems
AT&amp;T Wireless Services
Summa Corporation
Ticker symbol
Parrot SA
Frank William Gay
Bank One Corporation
Union Pacific Corporation

P&O Princess Cruises plc (stock symbol in London and NYSE: POC) was a shipping company that existed between 2000 and 2003, operating the P&O Cruises, Princess Cruises, P&O Cruises Australia, A'Rosa Cruises, AIDA Cruises and Ocean Village branded cruise lines.
 The company was formed from the de-merged passenger services of the Peninsular & Oriental Steam Navigation Company (P&O) and operated until 2003 when it was re-listed as Carnival plc following a merger with Carnival Corporation.
 Its registered office was in the City of Westminster, London.
Baker Hughes, a GE company (BHGE) is an American industrial service company, it is one of the world's largest oil field services companies.
 As of July 2017 Baker Hughes is now 62.5% owned by General Electric Company and 37.5% publicly traded (NYSE:BHGE).
 It operates in more than 120 countries, providing the oil and gas industry with products and services for oil drilling, formation evaluation, completion, production and reservoir consulting.
 Baker Hughes, a GE Company has its headquarters split between the legacy BHI headquarters in Houston, Texas and the legacy GE Oil & Gas headquarters in London, United Kingdom.
International Automated Systems, Inc. (IAS or IAUS) is a company with research and development in various industries, that has been involved in many ventures to design, produce, market, and sell high-technology products.
 It has been publicly traded since 1988, as an over-the-counter stock (stock symbol IAUS.PK).
 The founder and major shareholder is Neldon Johnson.
 It is currently based in Salem in Utah where it was founded in 1987.
AT&T Wireless Services, founded in 1987 as McCaw Cellular Communications, and now legally known as New Cingular Wireless Services, formerly part of AT&T Corp., is a wireless telephone carrier in the United States, based in Redmond, Washington, and later traded on the New York Stock Exchange under the stock symbol "AWE", as a separate entity from its former parent.
Summa Corporation was the name adopted for the business interests of Howard Hughes after he sold the tool division of Hughes Tool Company in 1972.
 The tool division would merge with Baker International in 1987 to form Baker Hughes, the world's third-largest oil-services company.
 The name "Summa", Latin for "highest", was allegedly chosen by several of Hughes' employees without consulting him first.
 Hughes was allegedly dissatisfied, and preferred the name "HRH Properties" - with the initials standing for both "Howard Robard Hughes" and "Hughes Resort Hotels".
 His suggestions were never implemented, and the company remained Summa for 18 years following Hughes' death.
A ticker symbol or stock symbol is an abbreviation used to uniquely identify publicly traded shares of a particular stock on a particular stock market.
 A stock symbol may consist of letters, numbers or a combination of both.
 "Ticker symbol" refers to the symbols that were printed on the ticker tape of a ticker tape machine.
Parrot SA is a French wireless products manufacturer company based in Paris, France.
 It was founded in 1994 by Christine/M De Tourvel, Jean-Pierre Talvard and Henri Seydoux.
 Stock symbol on Paris stock exchange: PARRO (PAOTF on USA's NASDAQ) and company is currently a member of the CAC Small 90.
Frank William "Bill" Gay (September 11, 1920 – May 21, 2007) was an American executive who oversaw several entities for Howard Hughes.
 He was chairman of the board of directors of the Hughes Air Corporation.
 He served as a senior vice president and member of the board of directors for the Hughes Tool Company.
 He was also president and chief executive officer of Summa Corporation.
Bank One Corporation was the sixth-largest bank in the United States.
 It traded on the New York Stock Exchange under the stock symbol ONE.
 The company merged with JPMorgan Chase & Co. on July 1, 2004.
 The company had its headquarters in the Bank One Plaza (now the Chase Tower) in the Chicago Loop in Chicago, Illinois, now the headquarters of Chase's retail banking division.
The Union Pacific Corporation (or simply Union Pacific) is a publicly traded stock holding company that was established in 1969 and it is the parent company of the current form of the Union Pacific Railroad.
 The company's stock symbol is ().