grotty(1) on Linux
The text 4d1b589dbbdd, as Debian 6.0 (Squeeze) shipped it.
groff driver for typewriter-like devices
Flags it lists
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-B -
-F -
-U -
-b -
-c -
-d -
-f -
-h -
-i -
-o -
-r -
-u -
-v