Memory apparatus and writing device having such an apparatus

摘要

Implement (1) has housing (2) with linearly retractable plug-in interface (3) to connect implement to external data processing unit. Interface is protruded or retracted using slotted guide (4) with guide slot (5) and guide pin (6) and internal tensioning spring to hold interface in position. Alternatively interface is moved by rotation or clicked in and out as in ball-pen.