Vintage Philips MC cartridges, but who built them?

@ All, thank you for your responses.

With respect to the Ortofon (T)MC200, I did once dismantle a broken one.
(one channel was dead) The generator inside looks very much like the generator
in the "Cantata" series, and the one in the A-90.

I still have another needle-less MC200 waiting for an occasional retip.

Best regards, L.

By the way, did anyone ever hear one of these?