What parts are you referring to? Nowadays there are so many companies making parts you never know what you're getting. I recently bought a part for one of my toyotas from amazon. It was advertised (in the pic) as aisin. The oe japanese manufacturer of the part. The box I got had beck arnley / made in china on it. I then opened it up to find a white plastic tube stamped koyo on it. With this sticker below and koyo stamped on the part. So i went from pissed to happy in a matter of seconds. Turns out the bearing portion of the part is originally made by koyo and the electronic part by aisin. This one I got was made by koyo (bearing part) and the electronic part by denso! wtf.
Altrom i've never heard of. Probably taiwanese or chinese.