We summarize results of magnetic measurements of the bright early B-type stars β Cep, ζ Cas, and V2052 Oph, which we found to be oblique rotators with a weak magnetic dipole field with polar strength of a few hundred Gauss. From stellar wind studies we derived their rotational periods very accurately, and matched the magnetic and stellar wind phases. From model atmosphere fits we derived the angles of the rotation and magnetic axis. All three stars show some chemical abundance anomaly, likely associated with the magnetic properties. The stars are also pulsating variables. This is of high asteroseismological interest, since these are the only early-type stars known with observationally determined rotation, pulsation and magnetic properties.