| 摘要 |
A timer meter is used chiefly in daily dental hygiene, in particular when cleaning teeth. It comprises a support (1) and two containers (5, 6) containing a medium (9) which flows from the first to the second container. The support (1) has one or two viewing sides, at least one of which carries a two-dimensional or relief-type representation of a human or animal head or head and neck. |
