Oce OP33 Reference Manual page 123

You can display the key for entering values in inches in the numeric entry screens.
NOTE
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3-12 Setting Specifications That Are Common to Each Function (Common Settings)
Call up the desired screen as follows:
(Additional Functions)
Select "On" or "Off," and press "OK."
Press "Done."
The specified mode is set and the display returns to the Basic Features screen.
Inch Entry