|
GB323323A
|
|
Improved means for operating roller shutters and the like
|
|
GB234578A
|
|
Improvements in or relating to surveying instruments
|
|
GB232362A
|
|
Improvements in surveying instruments
|
|
GB215673A
|
|
Improvements in optical instruments
|
|
GB230152A
|
|
Improvements in cinematograph projection
|
|
GB230384A
|
|
Mechanical improvements in cinematograph projection
|
|
GB210705A
|
|
Improvements in photographic and projecting lenses
|
|
GB215981A
|
|
Improvements in or relating to surveying instruments for mining purposes
|
|
GB198619A
|
|
Improvements in surveyors levels and like instruments
|
|
GB209187A
|
|
Improvements in pneumatic conveying systems
|
|
GB191688A
|
|
Improvements in carriers for pneumatic tube conveying systems
|
|
GB199205A
|
|
Improvements in catch devices for fireproof doors
|
|
GB209609A
|
|
Improvements in viewing devices for spirit levels
|
|
GB195473A
|
|
Improvements in fireproof doors
|
|
GB194929A
|
|
Improvements in machines for mechanically engraving metals, wood, stone and other materials
|
|
US1459864A
|
|
Erecting prism for telescopes and other optical instruments
|
|
US1468762A
|
|
Telescope, microscope, and the like
|
|
GB170035A
|
|
Improvements in and relating to scooters, velocipedes or the like
|
|
GB168923A
|
|
Improvements in and relating to optical lens systems
|
|
GB162692A
|
|
Improvements in variable power telescopes
|
