He also implemented Japan's first eight-hour work day system in 1919, after a massive strike by 30,000 workers threatened to bring down the government of Prime Minister Takashi Hara.

In 1906, after numerous technical difficulties, Kawasaki completed the first submarines made in Japan for the Imperial Japanese Navy.

Kawasaki produced numerous warships for the Japanese navy, ranging from destroyers to aircraft carriers until the end of World War II.

[5] Kawasaki started manufacturing rolling stock in 1907, and 4 years later produced its first steam locomotive, for the Japanese Ministry of Railways.

Kawasaki went on to build numerous innovative designs for the Imperial Japanese Army and Navy air services prior to World War II.