rements of exhaustive division would have been also
satisfied.

In the illustrative schedule, there being no miscellaneous
subclass for means having combined functions of rolling and
another, any patent having claims for the combination of a
means for rolling and a means for cooling would fall in
subclass 1, Miscellaneous. In that subclass would also fall
all "Mills," such as for rolling spiral conveyer-flights,
the same not falling under any of the subclasses 32-40, no
miscellaneous subclass of "Mills" and no special
article-rolling subclass having been provided; also all
parts or accessories, such as a water-cooled screen,
peculiarly adapted to rolling-mills, there being no
existing subclass of screens therein and no miscellaneous
subclass of parts. The arrangement of subclasses in Class
80 requires that the combination of a furnace and a
rolling-mill shall be placed in subclass 2, even if the
combination be designed and adapted for rolling annular
bodies (subclass 5) or tubes (subclass 11). Means special
to rolling a tube between a concave and roll must be placed
in subclass 13 rather than in subclass 18. A work-reversing
mill must be placed in subclass 33 rather than in subclass
34 even though it have three or more coacting rolls.

The rolling of "Screw-threads" having been given higher
rank than a "Concave and roll" mechanism, any concave and
roll mechanism limited for use in rolling screw-threads
should be formed into a subclass indented under
"Screw-threads" and not into a subclass "Screw-threads"
indented under "Concave and roll."

(10) Class schedules are arranged with certain subclasses appropriately
indented according to a commonly understood expedient. In a properly
indented schedule subclasses in column at the extreme left are the main
species (the proximate species) of the class. The titles and definitions
of all subclasses proximate to the class (at extreme left) must be read
with the title and definition of the class, as if indented under the
class title one space to the right; so also with the titles and
definitions of subclasses indented under other subclasses. If a title
has no number (as in Class 80, "Mills"), it represents merely a
subject-matter to be divided, assumed to have no representatives other
than those in the species indented under it. If a title having indented
species under it has a number, it not o