Siemens:

Halbleiter: Infineon
http://www.infineon.com

Passiv: Epcos
http://www.epcos.com

Harris:

Halbleiter: Intersil
http://www.intersil.com

Motorola:

Halbleiter: ON Semiconductor
http://onsemi.com

Ferranti:

Teil1: GEC Plessey Semiconductor -> Mitel
http://www.gpsemi.com -> http://www.mitelsemi.com

Teil2: Fujitsu

GEC Plessey Semiconductor:

Halbleiter: Mitel
http://www.mitelsemi.com

Stardivison:

SUN Microsystems
http://www.sun.com/staroffice

Signetics:

Philips Semiconductor
http://www.semiconductor.philips.com

Telefunken / TEMIC:

-> Vishay Intertechnology Inc.
http://www.vishay.de

-> Microtune (TEMIC-HF) (Tunermodule)
http://temic-hf.de
http://www.microtune.com

-> ATMEL
http://www.atmel.com
 

Hewlett Packard (HF-Division):

Agilent Technologies Semiconductor
http://www.agilent.com

Avantek:

Avantek -> HP -> Agilent Technologies Semiconductor
http://www.agilent.com

Olivetti Research Laboratory:

AT&T
http://www.uk.research.att.com/vnc