[PAR] [TLE] Unit Ei 1644 [SEP] Unit Ei 1644 (Japanese: 栄1644部隊 ) — also known as Unit 1644 — was a laboratory and one of the water purification centers established under control of the Epidemic Prevention and Water Purification Department.  It was established in 1939 in Japanese-occupied Nanking as a satellite unit of Unit 731. [PAR] [TLE] Unit 731 [SEP] Unit 731 (Japanese: 731部隊 , Hepburn: Nana-san-ichi Butai ) was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army that undertook lethal human experimentation during the Second Sino-Japanese War (1937–1945) of World War II.  It was responsible for some of the most notorious war crimes carried out by Japan.  Unit 731 was based at the Pingfang district of Harbin, the largest city in the Japanese puppet state of Manchukuo (now Northeast China).
[PAR] [TLE] Unit Ei 1644 [ SEP ] Unit Ei 1644 ( Japanese : 栄1644部隊 ) — also known as Unit 1644 — was a laboratory and one of the water purification centers established under control of the Epidemic Prevention and Water Purification Department . It was established in 1939 in Japanese - occupied Nanking as a satellite unit of Unit 731 . [PAR] [TLE] Unit 731 [ SEP ] Unit 731 ( Japanese : 731部隊 , Hepburn : Nana - san - ichi Butai ) was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army that undertook lethal human experimentation during the Second Sino - Japanese War ( 1937–1945 ) of World War II . It was responsible for some of the most notorious war crimes carried out by Japan . Unit 731 was based at the Pingfang district of Harbin , the largest city in the Japanese puppet state of Manchukuo ( now Northeast China ) .
Unit Ei 1644  was established in 1939 in Japanese-occupied Nanking as a satellite unit of Unit 731,  a covert biological and chemical warfare research and development unit of  what army?
Unit Ei 1644 was established in 1939 in Japanese - occupied Nanking as a satellite unit of Unit 731 , a covert biological and chemical warfare research and development unit of what army ?
the Imperial Japanese Army
the Imperial Japanese Army