src: www.trinksbrothers.com
TR Oil Services Ltd. (TROS) was a British company that traded in oilfield production chemicals.
Video TR Oil Services
History
TROS was established in 1972 by Simon Engineering in Manchester, United Kingdom. In 1983, German chemical giant Hoechst AG acquired a 50% share of the company. In 1993, Hoechst acquires the remaining shares and TROS became a 100% Hoechst subsidiary. Following the divestment of the Hoechst speciality chemicals business, TROS became a Clariant subsidiary in 1997, and was subsequently renamed Clariant Oil Services.
Source of the article : Wikipedia