.~.~> By pneumatic actuation of type-face or type-bar
DEFINITION
Classification: 400/179
For type-face selection or choice:
(under subclass 176) Subject matter wherein the energy of said fluid is used to select or choose a type-face* element that is to be impressed against a record-medium*, or is used to cause the selected or chosen type-face element to be impressed against the record-medium to imprint a character* symbol thereon.
(1) Note. In this subclass the typewriter usually operates by a typist depressing a key* element, the movement of the key producing the air pressure that actuates a type-bar* (to which the selected type-face is affixed) from rest position to the print-point* position.
(2) Note. The terms "select" and "choose" (or variants of those terms) and the differences between the terms are discussed in the Glossary under definitions such as case-shift*, type-face-carrier*, type-head* and type-head-carrier*. Briefly, a particular type-face is selected from among the many available from a type-set-assemblage*, whereas an upper-case* form of letter (as distinguished from a lower-case* form of the same letter) is chosen from the forms available on one key* element.
