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IBM -4900 User Manual

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Model IBM-4900 Top View
Do Not Disturb Key
Call Timer
Clock and Calendar Set ,
\
 
 
 
 
Handset Catch
 
 
Page All Extensions
Handset Cradle
New Call/Message
Mute Key 
Hold Key
Speaker 
Model IBM-4900 Rear View
 Jack
 Jack
DATA Jack
ADAPTER Jack