General ElectricFukushima's BWRs were GE, Hitachi, and Toshiba. It doesn't matter who the official brand is on the side because they're integrated and supported on-site using consulting companies who probably designed them and probably worked for both or all 3 companies at some point.
Sorry, not entirely correct: https://www.westinghousenuclear.com/nuclear-fuel/boiling-wat...
I worked for the company of one the main guys who designed BWR-4, consulted on BWRs, came up with SBWR (never used) and ABWR, and submitted ALWR plans to EPRI that never really went anywhere because of public relations and regulatory climate. ALWR became the basis of some SMRs like NuScale. WH and GE Hitachi SMRs are BWRs.