The Yoshigai firm is known by a few of their brand names, most famously Dia-Compe, which started out making brakes and brake parts, and eventually through their Dia-Compe USA office (AKA Cane Creek) introduced the modern threadless headset standard to the world.
Now they're one of the few remaining reliable manufacturers of parts for classic-style bikes, still focused on excellent rim brakes and all the little bits and bobs you need for them to work well. They're also the manufacturing partner of the Rivendell micro-ratchet shifters, the latest and best in non-clicky shifting. Dia-Compe have incredibly steady product lines, still made to the same high standard as the vintage parts that are still performing like new on all kinds of older bikes. The 1984 catalogue isn't terribly different from the 2024 one I have here in the C&L office, it's an admirable degree of consistency.
Dia-Compe, ENE, Gran Compe, and Dia-Tech are all fine Yoshigai names for different classes of products.
