ribs 30 32 34 the rings 24 26 28 being of predetermined decreasing diameter along the direction facing away from the actuator member 14 so as to define circumferential spaces or gaps 27 29 between adjacent rings 24 26 and 26 28 respectively the first indicator 22 also includes a base 36 that closes the bottom ring 28 e g to permit observation from below the operation indicator 20 with additional reference now to fig4 and 5 the operation indicator 20 also includes a second indicator 40 for the open position display shown in an upward position in fig1 and almost totally obscured by and having lower portions positioned within the first indicator 22 the second indicator 40 is attached to and driven by the actuator member 14 the second indicator 40 is also fabricated to define a plurality of concentric rings e g three rings 42 44 46 spaced axially along the direction of the path 16 the rings 42 44 46 being of predetermined decreasing diameter along the direction facing away from the actuator member 14 and being defined about a central web structure having a central tube 43 and web arms 45 47 49 the uppermost ring 42 is arranged to be above the mounting member 18 in this closed position each of the rings 42 44 46 also include three circumferentially spaced gaps 50 52 54 respectively the gaps 50 52 54 being dimensioned and.