|Note_en={{Dating|backref}} from the advertisement of the TCI organizer for 1952. {{OnBack|File:1952-Pelikan-400-Set.jpg}} Advertising for the [[Parker 51]] model, citing the [[aerometric]] system and the [[Pli-Glass]] sac. | |Note_en={{Dating|backref}} from the advertisement of the TCI organizer for 1952. {{OnBack|File:1952-Pelikan-400-Set.jpg}} Advertising for the [[Parker 51]] model, citing the [[aerometric]] system and the [[Pli-Glass]] sac. |