1370441 Crash restraint bags NISSAN MOTOR CO Ltd 24 Sept 1971 [29 Dec 1970] 39607/71 Heading B7B An inflatable bag, 20 is inflated through a semi-cylindrical diffuser tube 30 consisting of a flat rear wall 31 and a semi-cylindrical front wall 32 provided with apertures 34. A duct 35 connects the diffuser with a source of pressurized gas to expand the bag into the Fig. 4 (not shown) position. The apertures 34 may be. replaced by interrupted elongated slots 34a, Fig. 7 (not shown), continuous slots 34b, Fig. 8 (not shown), or apertures 34c, Fig. 9 (not shown). In a modification, the diffuser has a semi-cylindrical rear wall 38, Fig. 11, and a flat front wall 39 provided with apertures 41. The diffuser and bag may be mounted on a vehicle dashboard, Fig. 12 (not shown), on the rear of a front seat to protect a rear passenger, or an the exterior of a vehicle to protect a pedestrian.