Mitel Panther II 820 System Manual page 237

Electronic key telephone system
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Trillium Standard
Practice
--.
7.9 cm
(3.125 inch)
-1
Wooden
8.9 cm
(3.5 inch)
Power
Fail
Transfer
Unit
Figure 6-4 Power Fail Transfer Unit Wall Mounting
Installation and Commissioning
Page 18

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