For Typing On Flat Record-medium Or Against Flat Platen Patents (Class 400/23)
- Including a type-head (e.g., cylinder, disc, etc.) (Class 400/25)
- Against cylindrical backing (Class 400/26)
- Including adjustment of typewriter relative to book (e.g., to compensate for book thickness) (Class 400/27)
- Including adjustment of book support relative to typewriter (e.g., for top or bottom of book, etc.) (Class 400/28)
- Including feeding of wide carbon paper transverse to feed of record-medium (Class 400/38)
- Including spool for roll of carbon paper (Class 400/39)
- Including clamp or guide for carbon paper (Class 400/40)
- Including adjustment of platen perpendicular to its surface (Class 400/41)
- Including aligning and feeding manifold set (Class 400/42)