found: HeidelbergCement global website, April 8, 2008(1901 Merger with the Mannheimer Portland-Cement-Fabrik AG to form Portland-Cement-Werke Heidelberg und Mannheim AG, also including the acquisition of the Mainz-Weisenau cement plant, which had been founded in 1864; 1918: result of merger with the real estate and construction company "Stuttgarter Immobilien- und Bau-Geschäft AG", the Schelklingen cement plant becomes part of the company. The new company retains the name Portland-Cementwerke Heidelberg-Mannheim-Stuttgart AG until 1938; 1938 change of the company name to Portland-Zementwerke Heidelberg Aktiengesellschaft.)
