Contacting gefen technical support, Technical support, Email – Gefen EXT-MFP Audio/Video Multi-Format Processor User Manual
Page 4: Mailing address, Product registration

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Technical Support
(818) 772-9100
(800) 545-6900
8:00 AM to 5:00 PM Monday - Friday, Pacific Time
Fax
(818) 772-9120
Web
Mailing Address
Gefen, LLC
c/o Customer Service
20600 Nordhoff St.
Chatsworth, CA 91311
Product Registration
Register your product here:
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Contacting Gefen Technical Support