Machine Tool

Japan's high class machine tools depended on importing from Europe and US. Japan had supplied with 65,000 in 1939. But Japan supplied with 30,000 only in 1941, because of the German-Soviet War. The war stooped import from Europe via Siberia Railroad. Gears are basic mechanical element. Gleason in US and Maag in Switzland were typical companies.
Doku-So Sen(1941Jun22-1945May8)
Gleason
Maag

A college reserves old gear tools of pre War. One of them was made of Maag. Another site shows a chronological list of manufacturing gears in Japan.
Kikai Isan
Nihon Haguruma Kougyou-si

Nowdays

Top 10 machine tool co.

Name	Sales billion $
Yamazaki, jp	1.82
Trumpf, de	1.75
Gildemeister, de	1.67
Amada, jp	1.36
Okuma, jp	1.35
Mori, jp	1.29
JTECT, jp	1.24
-	1.20
大連機床集団, cn	1.16
瀋陽機床集団, cn	1.20

Toshiba was suspected that USN could not trace Soviet silenced submarines because of working propellants by Toshiba's 5-axis machine tool and Swedish NC in the cold war. Although that was not true, the story showed anxiety inferior than machine tool industry of Japan in the cold war. Now, Japan, Germany, China, Italy and Taiwan are nations of machine tools production.
Toshiba Kikai COCOM Ihan Jiken
TRUMPF
Gildemeister