Means For Demonstrating Apparatus, Product, Or Surface Configuration, Or For Displaying Education Material Or Student's Work Patents (Class 434/365)
- Mark formed by magnetic attraction between materials (e.g., particles in sheet made visible by movement of magnet over sheet, etc.) (Class 434/409)
- Mark formed by bonding sheet to underlying surface with pressure-applying stylus (e.g., Magic Slate, etc.) (Class 434/410)
- Erasable surface on endless belt (Class 434/411)
- Erasable surface on reel-mounted sheet (Class 434/412)
- Separate elements having erasable surfaces (Class 434/413)
- With pencil holder or sharpener (Class 434/415)
- With chart, illustration, or indicia (Class 434/416)
- Chalkboard cleaning means, chalk or eraser holder, or chalk dust receiver (Class 434/417)
- With ruler, straight edge, or holder therefor (Class 434/418)
- Pivotal about horizontal axis (Class 434/419)
- Vertically adjustable (Class 434/420)
- Attached to wall (Class 434/421)
- Hand-carried school slate (Class 434/422)
- Artificial slate formed of plural constituents (Class 434/425)