The Siemens Shaving Machine (SIemens RAsier MAschine SiRaMa) is a vibrating razor with external battery.Cap clamps on base, has an extra plate that does the shaking, so induced by a pin that rises from the handle. Long wire with a electrical connector, plugs into the batterycontainer. This has a "foot" that can help it to stand straight. Not sure if modern batteries will fit, so no idea if this still vibrates.
Userguide in Swedish
Userguide in Swedish