Fairly infamous — they made many older Filco keyboards as well as the Matias Tactile Pro and Tactile Pro 2.0. However, both Diatec (owner of the Filco brand) and Matias abandoned them for Costar, and shortly afterwards Strong Man went bust. Amongst other sins, Strong Man called any unbranded switch a "Strong Man" switch, convincing Matias that Forward SKBM Grey (following the termination of the use of the Alps branding) used in the then-new TP2 was a Strong Man product (where in reality the TP had already transitioned to grey switches without Matias noticing); they also called four-tab clones "Strong Man" switches, even though they just appear to be regular Himake switches. Nan Tan did the same: the "N" in the -EN keyboards appears to denote Nan Tan switches (there's a brochure scan here somewhere demonstrating their use of so-called "Nan Tan switches") — yet these too seem to just be Himake. (Shared tooling may account for those, but not for Forward's switches.)
Strong Man also appear to have commissioned a four-tab clone that takes Cherry keycaps, but this seems not to have gone into production.
Strong Man keyboards often have "SMK" in the model number, which is easily confused with SMK in Japan.