On the shop floor of a factory filled with the telltale scent of welded metal, Japanese-Brazilians are working hard to produce filtering tanks for lubricating oil.

"If the tank leaks, it will be big trouble," an employee at a Bunshodo Corp. factory in Kani, Gifu Prefecture, said in fluent Japanese.

Just like the factories themselves, some Japanese-Brazilians in the manufacturing sector have become indispensable to companies in the Tokai region because they have developed their mastery of their craft to the level of artisans.