a handle 110 consisting of two portions 111 and 112 which may be connected by appropriate fastening means such as screws 113 the handle 110 may be connected to the two sets 80 and 81 of fig5 for handcarrying them by respective flexible straps 82 and 82 39 from the respective sets 80 and 81 in this case the handle 110 may be disposed parallel to the housing side walls 46 47 fig1 illustrates two sets of housings and drawers 80 and 81 each set 80 and 81 consist of two housings and drawers and the two sets are disposed adjacent to each other the flexible straps 82 interconnect housings 11 and 11 39 of set 80 and the straps 82 39 interconnect housings 11a and 11a 39 of set 81 to each other both straps 82 82 39 are jointly clamped between portions 102 and 103 this will prevent housings 11 and 11 39 from separating as well as housings 11a and 11a 39 the alignment tabs such as 51 again lock housings 11 and 11 39 as well as housings 11a and 11a 39 so that they cannot move relative to assemblies 80 and 81 finally push pins or rivets 115 extending between housings 11 and 11a prevent housings 11 and 11a from moving respectively to.