| ReturnTo Theme-Group-Choice | Onelevelup |
| 2H021 | Overhead projectors and projection screens | |
| G03B21/132 ;21/56-21/64 | ||
| G03B21/56-21/625 | AA | AA00 PROJECTION-SCREEN DEVICES |
AA01 | AA02 | AA03 | AA04 | AA05 | AA06 | AA07 | AA08 | AA09 | |
| . Foldable screens | . Screens that can be assembled or disassembled | . Rollable screens | . . Winding units | . Support or mounting of screens | . . Adjustment of the inclination of the screen | . Oscillation or rotation of the screen | . Screens for panoramic projection or planetariums | . Screens for use with movies with sound | ||||
| BA | BA00 SCREENS PER SE |
BA01 | BA02 | BA03 | BA04 | BA05 | BA06 | BA07 | BA08 | BA09 | BA10 | |
| . Reflection-type screens | . . Structure of the reflecting surface | . . . Fresnel-type surfaces | . . Transparent spheres | . . Metal powders | . . Aluminum reflecting surfaces | . . Reflecting surfaces with a translucent layer | . . Synthetic resin layers | . . Photo-absorptive layers | . . Manufacturing of screens | |||
| BA11 | BA12 | |||||||||||
| . Fluid screens | . Fluorescent screens | |||||||||||
| BA21 | BA22 | BA23 | BA24 | BA25 | BA26 | BA27 | BA28 | BA29 | BA30 | |||
| . Transmission-type screens | . . Fresnel lenses | . . Lenticular lenses | . . Combination of Fresnel lenses and lenticular lenses | . . . Prevention of moire | . . Photo-absorptive layers | . . Optical diffusion layers | . . Shapes of surfaces | . . Materials | . . . Crystalline polymers | |||
| BA32 | ||||||||||||
| . . Manufacturing of screens | ||||||||||||
| G03B21/64 | CA | CA00 FRAMES FOR HOLDING OF PROJECTION FILM |
CA01 | CA02 | CA03 | CA04 | CA05 | CA06 | CA08 | CA10 | ||
| . Film-mounting units | . . Mounting of multiple films | . . . Microfilm jackets | . . Film-mounting frames for overhead projectors | . . Film-mounting units for retrieval of information | . . . Use of magnetic recording | . Film-mount housing units | . Manufacturing of film mounts | |||||
| G03B21/132 | DA | DA00 OVERHEAD PROJECTORS |
DA01 | DA02 | DA03 | DA04 | DA05 | DA06 | DA07 | DA08 | ||
| . Projected images to be displayed | . . Recording of control information | . . Liquid crystal displays | . . Indicator bars | . Light-source units | . . Cooling units | . Fresnel-capacitor lenses | . Projection heads | |||||
| DA11 | DA12 | DA13 | DA14 | DA16 | DA17 | DA18 | ||||||
| . Reflection types | . Transmission types | . Combination with copying machines | . Devices that can be folded or disassembled | . Adjustment of the quantity of light | . Variable-power projectors | . Correction of screen distortion |