using a print element with projections on its surface impacted or impressed by hammers

Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed > characterised by selective application of impact or pressure on a printing material or impression- transfer material > using a print element with projections on its surface impacted or impressed by hammers

Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed (mounting, arrangement or disposition of types or dies B41J1/00) > characterised by selective application of impact or pressure on a printing material or impression-transfer material > using a print element with projections on its surface impacted or impressed by hammers