| 摘要 |
The device comprises a metal chassis (2a) bent into a U shape and cut out with a light support (17), a support for a fluid tight box, including within the box an integrated circuit chip (27), and an indented lateral flange (22, 23, 24); the light source is shown at (34). The chassis (2a) with the light source and the box in position is fixed by means of the holes (21, 21a, 20, 20a) to the fixed part (37), when the coded disk (39) integral with the rotary shaft (38) is in position between the source (34) and the chip (27).
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