@defun valid-device-type-p device-type
This function returns whether @var{device-type} (which should be a symbol)
-species a valid device type.
+specifies a valid device type.
@end defun
@defun valid-device-class-p device-class
This function returns whether @var{device-class} (which should be a symbol)
-species a valid device class.
+specifies a valid device class.
@end defun
@defvar terminal-device