| Patents for G09B 23 - Models for scientific, medical, or mathematical purposes, e.g. full-sized device for demonstration purposes (20,724) |
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| 02/28/1990 | CN2053775U Double-layer bidirectional force-arm analogy teaching aid |
| 02/22/1990 | WO1990001761A1 Radiation detection training apparatus |
| 02/21/1990 | CN2053362U Electric current balance |
| 02/21/1990 | CN2053361U Solid extending force demonstrator |
| 02/20/1990 | US4902232 Dental training model with artificial teeth set |
| 02/14/1990 | CN2052924U Demonstration experiment device for giving out specific heat concept |
| 02/13/1990 | US4900255 For two-stage Quincunx |
| 02/07/1990 | CN2052562U Movable pattern of magnetic force for subtrahend splitting of animal cell |
| 02/07/1990 | CN2052561U Multi-functional electron tog bricks |
| 02/07/1990 | CN2052560U Electricity experiment box |
| 01/31/1990 | EP0352753A2 Model kit for learning blood typing principle |
| 01/31/1990 | CN2052136U Optcial-experiment box |
| 01/24/1990 | CN1006585B Circuit teaching device with cards and socket connecting units |
| 01/23/1990 | US4895169 Disposable non-invasive stimulating electrode set |
| 01/17/1990 | CN2051376U Simulated sliding rheostat teaching aid |
| 01/17/1990 | CN2051375U Bernoulli principle combined demonstrater |
| 01/16/1990 | US4894040 Toy building element with elements for providing positional information |
| 01/16/1990 | US4894013 Anthropomorphic cardiac ultrasound phantom |
| 01/10/1990 | CN2050996U Multifunctional unit for electricity teaching and game |
| 01/10/1990 | CN2050995U Steam condenser comprehensive experimental unit |
| 01/10/1990 | CN1038715A Multi-functional wave demonstrating apparatus |
| 01/03/1990 | EP0213169B1 Device for teaching treatment of skeleton injuries |
| 01/03/1990 | CN2050640U Buoyancy and inner pressure of liquid displaying apparatus |
| 12/27/1989 | CN2050206U Multi-purpose crystal model |
| 12/27/1989 | CN2050205U Elements periodic instrument |
| 12/21/1989 | DE3918955A1 Technical simulation of the biological muscle principle as a technical muscle. Robot resembling an animal or a human being and having technical muscles. Parts of this robot as prostheses. Further applications of the muscle: as lifting and tensioning device, as muscle motor, for positioning of an object by several muscles, as adjustment means for the range of spring |
| 12/20/1989 | CN2049809U 真空验电器 Vacuum electroscope |
| 12/20/1989 | CN2049808U Experiment instrument for heat radiation law |
| 12/20/1989 | CN2049807U Demonstrator for teaching free falling body |
| 12/20/1989 | CN2049806U Rotary teaching aid for teaching mathematics |
| 12/20/1989 | CN2049805U Number sequence limit demonstrator |
| 12/13/1989 | EP0345301A1 Ophthalmologic phantom system |
| 12/13/1989 | CN2049389U Dynamic heart model |
| 12/13/1989 | CN2049388U Gas explosion reaction device with electronic detonation |
| 12/13/1989 | CN1037985A Demonstrator of superconductivity |
| 12/12/1989 | US4886459 Precision controlled cartesian diver |
| 11/30/1989 | WO1989011680A1 Process and device for producing models of industrial parts by the action of light |
| 11/23/1989 | DE3816010A1 Dental artificial skull with teeth |
| 11/23/1989 | DE3816009A1 Dental artificial skull with teeth |
| 11/23/1989 | DE3816008A1 Dental artificial skull with teeth |
| 11/22/1989 | CN2048223U Integrated experiment device for fluid |
| 11/22/1989 | CN2048222U Boards insert teaching aid of space model with turnable coordinates projective plane |
| 11/21/1989 | US4882763 Method of making a rock-pore micromodel involving generation of an accurate and reliable template image of an actual reservoir rock pore system |
| 11/15/1989 | EP0341253A1 Building blocks. |
| 11/15/1989 | CN2047822U Demonstrator for regular pattern imaged by lens |
| 11/15/1989 | CN2047821U Hanging-type flow demonstrator based on bubble tracing |
| 11/15/1989 | CN2047820U Modular teaching aid of solid geometry |
| 11/08/1989 | CN2047431U Multi-functional electronic acousto-optic demonstrator |
| 11/08/1989 | CN2047430U Iron wire teaching aid joined by magnetic block |
| 11/07/1989 | US4878388 Method for simulating and demonstrating the gas exchange during mandatory or assisted ventilation and apparatus therefor |
| 11/07/1989 | CA1262626A1 Deflection and topography assessment mechanism anthropomorphically natural |
| 10/31/1989 | US4877454 Water, proteinaceous material, fatty acid di- or triglyceride |
| 10/31/1989 | US4877406 Manipulatable, spherical educational and amusement devices |
| 10/26/1989 | DE3900168A1 Device for constructing a demonstration and/or working example of a jaw model |
| 10/25/1989 | CN2046660U Multi-purpose board for physics and electricity experiment |
| 10/18/1989 | CN2046252U Comprehensive displaying instrument of joule law |
| 10/17/1989 | US4873867 Redundant signal device for auto crash testing |
| 10/11/1989 | CN2045876U Combined teaching aid chest |
| 10/11/1989 | CN2045875U Joule's law experimental device |
| 10/11/1989 | CN1036280A An instrument for demonstrating the skin effect with low-frequency signal |
| 10/10/1989 | US4872841 Demonstration device for illustrating spinal misalignment |
| 10/04/1989 | CN2045536U Tuning fork device without adjustment commotion |
| 10/04/1989 | CN2045526U Sports-man exercise model for physical training |
| 10/04/1989 | CN2045525U Demonstrator for superconductor magnetic suspension |
| 10/04/1989 | CN2045524U Inserting type paper teaching aid of plane-space model |
| 10/04/1989 | CN2045523U Multipurpose teaching aid of projecting board model |
| 10/04/1989 | CN2045522U Demonstrator for mathematical induction |
| 10/04/1989 | CN2045485U Horizontal type polarization experimental apparatus |
| 09/21/1989 | WO1989008905A1 Training aid to simulate detection of radioactivity |
| 09/19/1989 | US4867686 Breast cancer detection model and method for using same |
| 09/19/1989 | US4867168 Apparatus for simulating inspection equipment |
| 09/13/1989 | EP0332322A2 Data creating, storage and processing system |
| 09/12/1989 | US4865552 For practicing surgical cataract removal; crosslinked gelatin hydrogel, sodium alginate or polyoxyethylene glycol encapsulan t, vinyl or vinylidene chloride copolymer transparent film |
| 09/12/1989 | US4865551 Ophthalmologic phantom system |
| 09/12/1989 | US4865550 Anatomical educational amusement ride |
| 09/06/1989 | CN2044091U Body blood circulating system dynamics teaching aid |
| 09/06/1989 | CN2044090U Electromagnetic oscillation demonstrating instrument |
| 09/05/1989 | US4863385 Cardiopulmonary resuscitation (CPR) sequencer |
| 08/30/1989 | CN2043780U Lamp with sealed box containing aquatic animal and plant |
| 08/30/1989 | CN2043753U Electronic thermometer for teaching by demonstration |
| 08/23/1989 | CN2043404U Infrared dual-purpose spectrum demonstration apparatus |
| 08/23/1989 | CN2043403U Multifunctional combined teaching aid for mathematics |
| 08/23/1989 | CN2043402U Multipurpose teaching demonstrator for sine function, vibration and wave |
| 08/16/1989 | CN2042993U Three-function acousto-optical display ionic conduction test instrument |
| 08/16/1989 | CN2042992U Superconducting characteristic demonstrating device |
| 08/15/1989 | US4856998 Teaching aids |
| 08/09/1989 | CN2042616U Vector resolution teaching-aid |
| 08/02/1989 | CN2042204U High-sensitivity contactless electrometer |
| 08/01/1989 | US4852585 Electrocardiology |
| 07/26/1989 | CN2041869U High precision high-voltage pulse spark tracing power |
| 07/26/1989 | CN2041843U Adjustable type dual-purpose dissecting table |
| 07/26/1989 | CN2041842U Material testing machine for teaching |
| 07/26/1989 | CN2041841U Half-wave arcing timer |
| 07/25/1989 | US4851665 System for sensing ions in aqueous solution |
| 07/25/1989 | US4850877 Method of determining stress effects in components of the human knee and anthropomorphic leg device therefor |
| 07/25/1989 | US4850876 Training device for practicing emergency life saving techniques |
| 07/25/1989 | US4850356 Defibrillator electrode system |
| 07/11/1989 | US4846988 Particles, magnetic and nonmagnetic |
| 07/11/1989 | US4846684 Jaw model |
| 07/05/1989 | EP0323099A2 Last for preparing custom footwear |