|
GB1084419A
|
|
Masking assembly for use with an optical projector
|
|
GB1087085A
|
|
Slide-changing mechanism
|
|
GB1087086A
|
|
Slide projectors
|
|
GB1087084A
|
|
Slide-changing mechanism
|
|
GB1103552A
|
|
Optical projectors
|
|
GB1103553A
|
|
Optical projectors
|
|
GB1026646A
|
|
Slide projectors
|
|
GB945761A
|
|
Cinematograph projector
|
|
GB873887A
|
|
Slide holders for use with picture projecting apparatus
|
|
GB817653A
|
|
Apparatus for co-ordinating the actions of a tape-type sound recorder and a still-picture projecting lantern
|
|
GB818195A
|
|
Light projection apparatus
|
|
US2811714A
|
|
Signalling lamps
|
|
GB745109A
|
|
Signalling lamps
|
|
GB722539A
|
|
Optical reflectors
|
|
GB676611A
|
|
Improvements in and relating to lamp-signalling apparatus
|
|
GB589460A
|
|
Improvements relating to air valves applicable to the cooling of mercury vapour and other gas discharge lamps
|
|
GB589182A
|
|
Improvements relating to pneumatically actuated electric switches
|
|
US2359187A
|
|
Signaling lamp
|
|
GB573144A
|
|
Improvements relating to means for inspecting gun barrels
|
|
GB572863A
|
|
Improvements relating to means for inspecting gun barrels
|
