Question: In 1988 Allmänna Svenska Elektriska Aktiebolaget merged with a swiss company headquartered in what city?

Context paragraphs:
SCA Transforest: SCA Transforest, part of Svenska Cellulosa Aktiebolaget is a Swedish company dealing with transport and logistics.  Its activities include warehousing and stevedoring at their own terminals in Europe, a ship agency and customs clearance.  The company also has a brand for marine transportation, both inside Europe and overseas transports in own or rented vessels.

ABB Group: ABB (ASEA Brown Boveri) is a Swedish-Swiss multinational corporation headquartered in Zürich, Switzerland, operating mainly in robotics, power, heavy electrical equipments, and automation technology areas.  It is ranked 286th in The World's Most Admired companies in the Fortune 500 global list of 2016.  ABB has been a Global Fortune 500 company for 23 years.

SJ X5: X5, X8 and X15 was a series of three or four car electric multiple units operated by Statens Järnvägar (SJ) of Sweden as express trains. Eight units were built by Allmänna Svenska Elektriska Aktiebolaget (ASEA) in 1947–48 and were in service until 1985.

Swedish library classification system: The Swedish library classification system, (Swedish: "Klassifikationssystem för svenska bibliotek" ), or SAB system ("SAB-systemet") is a library classification system for use in many public, school, and research libraries in Sweden.  It primarily classifies books but is also used for other media, such as audio and video recordings.  The first edition of the system was released in 1921 and was based on the classification that was used in the accession catalogs of the scientific libraries of that time.  The abbreviation 'SAB' is for "Sveriges Allmänna Biblioteksförening" ("Sweden's public library association").  SAB merged with Svenska bibliotekariesamfundet ("Swedish librarians' association") to form present day Svensk Biblioteksförening ("Swedish library association").

ASEA: Allmänna Svenska Elektriska Aktiebolaget (English translation: General Swedish Electric Company; Swedish abbreviation: ASEA) was a Swedish industrial company.  In 1988 it merged with the Swiss company Brown, Boveri & Cie (BBC) to form ABB Group.  ASEA still exists, but only as a holding company owning 50% of the ABB Group.

SJ X6: X6 was a series of three-car electric multiple units operated by Statens Järnvägar (SJ) of Sweden as local trains around Stockholm and Göteborg.  Three units were built by Allmänna Svenska Elektriska Aktiebolaget (ASEA) in 1960 and were in service until 1985.

ETL SEMKO: ETL SEMKO (formerly Electrical Testing Laboratory) is a division of Intertek Group plc (LSE: ITRK) specialising in electrical product safety testing, EMC testing, and benchmark performance testing.  ETL SEMKO operates more than 30 offices and laboratories on six continents. SEMKO ("Svenska Elektriska Materielkontrollanstalten" "The Swedish Electric Equipment Control Office") was, until 1990, the body responsible for testing and certifying electric appliances in Sweden.  The "S" mark was mandatory for products sold in Sweden until the common European CE mark was adopted prior to Sweden's accession to the European Union.

SJ T45: T45 is a Swedish diesel-electric locomotive operated by Swedish State Railways (Swedish: "Statens Järnvägar, SJ" ) and later other companies.  It was in service with SJ from 1971 to 1976, after which it was used by some industrial railways.  It is the only diesel locomotive to be built by Allmänna Svenska Elektriska Aktiebolaget (ASEA).

SCA (company): Svenska Cellulosa Aktiebolaget (SCA, English: "Swedish Cellulose Company") is a Swedish timber, pulp and paper manufacturer with headquarters in Stockholm.  It has approximately 44,000 employees and a turnover of approximately SEK 104 billion (€11,1 billion).  Its main products include personal publication papers, solid-wood products and forest-based biofuel.  The company's ten largest markets are Germany, United Kingdom, United States, France, Sweden, Italy, the Netherlands, Spain, Denmark, Australia, Mexico and Belgium.  SCA is Europe's largest private owner of forest land, with 2.6 million hectares, the size of Macedonia.  (Sweden's largest forest owner is the governmental Sveaskog with 3.3 million hectares, an area slightly larger than Moldova.)

Ljungström turbine: The Ljungström turbine is a steam turbine innovated in the early 20th century by the Swedish brothers Birger (1872-1948) and  Fredrik Ljungström (1875-1964).  It is also known as the STAL turbine, from the company name STAL (Swedish: "Svenska Turbinfabriks Aktiebolaget Ljungström" ).

Supporting paragraphs: ASEA ABB Group
Answer: Zürich