US PATENT SUBCLASS 400 / 24
.~ For typing on a book

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

23  DF  FOR TYPING ON FLAT RECORD-MEDIUM OR AGAINST FLAT PLATEN {14}
24.~ For typing on a book {4}
25  DF  .~.~> Including a type-head (e.g., cylinder, disc, etc.)
26  DF  .~.~> Against cylindrical backing
27  DF  .~.~> Including adjustment of typewriter relative to book (e.g., to compensate for book thickness)
28  DF  .~.~> Including adjustment of book support relative to typewriter (e.g., for top or bottom of book, etc.)

DEFINITION

Classification: 400/24

For typing on a book:

(under subclass 23) Subject matter wherein significance is attributed to a typewriter particularly intended for typing on a book.

(1) Note. A "book" is an assemblage of pages* or sheets that have been fastened or bound together. One of the characteristics of a book that is significant in this subclass or the subclasses indented hereunder is that pages are turned to be inverted for recording of information thereon. As a consequence of such use, the number of pages on one side of the binding will increase as the number of pages on the other side of the binding decreases, resulting in unequal thicknesses of material on each side of the binding.