Optical, opto-electronic and photoelectric sensors for sensing light and light reflected by objects; light barriers, light scanners, safety light grids and light grids for measuring object dimensions; optical, opto-electronic, and photoelectric sensors for use in recognizing the shape, position, contour, volume, [ distance, texture or surface characteristics ] of articles for the purpose of automatic inspection, for inspection of plain or web-like materials [ and checking the characteristics of such materials, for fault recognition, ] for automatic identification, quality control, positioning, handling and control of articles, and for the purpose of automation in the fields of manufacture, quality control, storage, flow of goods, sales, transport, laboratory, plants, traffic, installations and public buildings; electronic and/or optical sensors for the purpose of measuring a position or length or distance; [ electronic position encoders; ] optical sensors for distance measurements; optical, opto-electronic and photoelectric sensors for sensing light and light reflected by objects for the purpose of safety guarding and monitoring of rooms, spaces, points of danger or danger zones; safety light curtains; scanners working on an electronic basis and in the field of infrared, visible or ultraviolet radiation; scanners which operate with a scanning beam for the scanning of specific surfaces and/or spatial regions

[ Installation, maintenance and repair of electric, optic and opto-electronic appliances ]