| 摘要 |
PCT No. PCT/AU86/00286 Sec. 371 Date May 26, 1987 Sec. 102(e) Date May 26, 1987 PCT Filed Oct. 2, 1986 PCT Pub. No. WO87/02167 PCT Pub. Date Apr. 9, 1987.The invention concerns an improvement in a display member of the type comprising a plurality of reference members (14) accommodated within a common chamber (11) filled with an opaque fluid wherein each reference member is independently movable between a display position at which it is in face to face engagement with a display face (12) of the chamber (11) and a non-display position at which it is out of engagement with the display face. The improvement comprises each reference member (14) being associated with a boundary wall (19) which surrounds the sides of the reference member when at its non-display and/or display position. The function of the boundary wall (19) is to direct fluid entering or escaping from the space between the reference member and a face of the chamber adjacent the boundary member.
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