【运输】字符间距控制机构【运输】特征间隔取样机器

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

character-spacing mechanism selective printer

character-spacing mechanism in selective printers

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