What year did the company, who operated Slick Mine No. 91 after 1923, begin operations?
1904
Bethlehem Steel
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Slickville Historic District
Slickville Historic District is a national historic district located at Salem Township, Westmoreland County, Pennsylvania.
 It encompasses 90 contributing buildings and 1 contributing structure in the unincorporated village of Slickville.
 The company built mining town was built between 1916 and 1923.
 The contributing resources include workers and managers housing, four utilitarian mine-related buildings, a church, a school, a pump house, and a company store.
 The community was originally developed by the Cambria Steel Company, and later acquired by Bethlehem Steel who operated Slick Mine No. 91 after 1923.
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 The project includes the installation of 2320 MW MW to generate an annual average energy of 12,100 GWh .
 Ten Kaplan generator units, of 230 MW , manufactured by Argentinian company IMPSA, were predicted to begin operations between 2012 and 2014.
 The first generator was installed but not yet commissioned in April 2012.
 Behind scheduled, the dam began to impound its reservoir on 16 November 2015.
 These units had the world record as of 2012 in power generation at nominal head for Kaplan turbines.
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 The airline had its inaugural flight in October 2014 and plans to begin operations between Siem Reap and Sihanoukville by the end of the year. Smokers Express
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 Founded in 1993 by William Walts and George "Mickey" Richardson, the company never received enough funding to begin operations. Waves (Airline)
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 The airline is a subsidiary of Waves Technologies Limited, which is a privately owned company.
 It plans to operate from its hub at Guernsey Airport to up to 15 regional airports in and around the Channel Islands.
 Waves also plans to undertake cargo and medevac activities, on demand.
 It is scheduled to begin operations in July 2017. Televisa (Venezuela)
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 It was the second television station to begin operations after the state-owned Televisora Nacional.
 In 1960, Televisa was purchased by and re-branded as Venevisión and became in business' Cisneros family.