In 1920, Careszer was established in the United States. Since its establishment, the company has focused on the production and research and development of partition products, providing customers with high-quality and fashionable products. 1961 The French Ottoman Company was established in 1985 and started to conduct business in Asia (South Korea). In the same year, the South Korean factory was put into production. In 1986, the Hong Kong company was established. In 1996, the Korean company passed the ISO9002 certification and established the Shanghai Representative Office in 2004. In October 2007, Kalez was established. Zhuo (Shanghai) Building Materials Co., Ltd. (Shanghai Factory) now has customers throughout mainland China and Hong Kong and Macau, and has become a product that pursues fashionable and gorgeous design styles such as financial institutions, consulting companies, advertising companies, etc., and is also for foreign and state-owned enterprises. The office decoration of the headquarters and the foreign investment representative office provides an atmosphere.

Clestra Hauserman designs, manufactures and installs prefabricated removable or disassembled office partitions to meet the ever-changing needs of all customers. Clestra Hauserman system partitions are made of steel, glass, wood or composite materials, and have long been the leading brand of office partitions worldwide. Clestra Hauserman system partitions can re-plan the building while fully respecting the initial effect, while ensuring the sound insulation and fire resistance of the product. The company has a global vision and attaches great importance to environmental protection, and has won the internationally recognized green building certificates (LEED, HQE, BREEAM) for many buildings.