eemed complete until the disclosures appropriate to it found as parts
of more complex inventions in other classes, or disclosures of analogous
matter in other classes, are either cross-referenced into it or cross
search-notes made.

(11) To indicate cross-references, from one subclass to another within
the class or from the class under consideration into another class,
attach a small slip of paper to the patent and mark on the slip the
subclass number in which the cross-reference shall be mounted. If the
matter to be cross-referenced relates only to a portion of a voluminous
patent, the portion of the specification and drawing to be
cross-referenced should be indicated. If the cross-reference falls
outside the class, the class number should be noted in addition to the
subclass number.

(12) Should it be found that the handling of copies in making
examinations detaches the cross-reference slips, it may be advisable to
mark lightly but legibly in pencil on the lower right-hand corner of the
examiner's photolithograph the number of the subclass or subclasses into
which it is to be cross-referenced, or the number of the class and
subclass in case it is to be cross-referenced to another class.

(13) Whether cross-reference notations are written on a separate slip or
on the photolithograph, the number of the class and subclass into which
a patent is to be cross-referenced should always be preceded by X (thus
X 101-23) in order to distinguish the original classification notation
from the cross-reference notation and enable sorting and indexing to be
done without confusion.

(14) To indicate cross-references from other classes into the one being
reclassified, set down the number of the patent in a notebook, placing
after the number (1) the class and subclass in which it is classified;
and (2) the number of the class and subclass in which it is to be
cross-referenced.

(15) Should new subclasses be formed or transfers of patents be
determined on, and lists of the patents, instead of copies thereof, be
furnished clerks for the purpose of making such subclasses and transfers
and correcting the official indexes and other records, each patent
should be listed by number in column to the left of a sheet of paper or
notebook, and opposite each patent number on the same sheet should be
written (1) the number of the class and subclass in which it is
officially classified; (2) the number of the class and subclass to which
it is inte