Abstract: A navigation system can indicate a relationship in position between a main vehicle and a related vehicle without reducing a map picture on a display unit. A second display unit (6a) is provided independently of a first display unit (3a) for a map picture in a navigation system. The second display unit (6a) indicates a position of the related vehicle by means of a direction (11) relative to the main vehicle and a distance (12) from the main vehicle to the related vehicle. Preferably, the direction (11) and distance (12) are indicated by an arrow or characters and by digits, respectively. This makes the display obvious.

Abstract: A bulb socket which can receive both a round base bulb and a wedge base bulb. A bulb-receiving portion (23) is provided in its interior with a pair of bulb insertion grooves (26) which are symmetrically spaced at an angle of 180.degree.. The groove (26) has a guide portion (27) extending axially from an open edge to an inner part and an engaging portion (28) turning circumferentially at an inner end of the guide portion (27). A pair of projections on the base of the round base bulb are inserted into and secured to the bulb insertion grooves (26), respectively. Opposite side edges of a base of the wedge base bulb are inserted into and secured to the guide portions (27), respectively.

Abstract: A silver halide black-and-white photographic light sensitive material is disclosed, comprising a support provided thereon a silver halide emulsion layer and provided farther from the support another higher-sensitive silver halide emulsion layer, wherein both silver halide emulsion layers each have a coating weight of silver of not less than 0.5 g/m.sup.2 and are sensitized substantially to the same spectral region; at least two, different hydrazine compounds being contained in the silver halide emulsion layers or another photographic component layer.