【运输】滑块、字符间距机构、选择性打印机

positive feed with pawl and ratchet of character-spacing mechanisms inselective printers

character-spacing mechanism selective printer

character-spacing mechanism

character-spacing reference-line【计】

positive feed with pawl and ratchet of character-spacing mechanisms

character-spacing mechanism, adjustable

escapement with rack for character-spacing mechanism in selective printer

positive feed with pawl and ratchet of character-spacing