Yasuko Yamaguchi

Part of ART FORCE JAPAN Co., Ltd., Crown Industry, Inc. was founded in 1976 and is based in Tsuchiura, Japan. The Japanese company offers leasing services for simplified soil retention and plashiki, as well as ground improvement methods using crushed stones and various ground improvement methods. Crown Industry introduced a highly safe and highly constructing method called "simple contact". The company was acquired by ART FORCE JAPAN Co., Ltd. on December 31, 2016.

Part of ART FORCE JAPAN Co., Ltd., Tsukamoto Komuten KK is a Japanese company that engages in civil engineering and construction, store improvement work, and repair services. The company is based in Odawara, Japan. The company was founded in 1978. Tsukamoto Komuten KK was acquired by ART FORCE JAPAN Co., Ltd. on April 30, 2017.