Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source {per colour}, e.g. lighting beams or shutter arrangements using liquid crystals
Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source {per colour}, e.g. lighting beams or shutter arrangements using liquid crystals