| 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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| 06/28/1989 | CN2040271U Central bright spot demonstrating device for opetical disk diffraction |
| 06/28/1989 | CN2040270U Multi-functional sensitive electroscope |
| 06/14/1989 | EP0319623A1 Apparatus for simulating inspection equipment |
| 06/14/1989 | CN2039446U Analogue circuit testing box with block construction |
| 06/14/1989 | CN2039435U Test equipment for stroboscopic photography |
| 06/13/1989 | USRE32950 Funnel teaching method and apparatus |
| 06/13/1989 | US4838795 Artificial joint components for teaching, research and visual aids |
| 06/13/1989 | US4838794 Metric block toy |
| 06/13/1989 | US4838788 Articulator for mastering denture correcting technics |
| 06/07/1989 | CN2039045U Vector compound instrument |
| 05/30/1989 | US4834103 Disposable physiological electrode set |
| 05/24/1989 | CN2038262U Flute apparatus for electrophoresis with vertical board of no adhesive leakage |
| 05/24/1989 | CN2038261U Teaching aid for frictional force displaying |
| 05/24/1989 | CN2038260U Multipurpose solid geometry teaching aid |
| 05/23/1989 | US4832978 Simulated connective tissue for construction of models and prostheses |
| 05/23/1989 | EP0238636A4 Method of manufacture and implantation of corneal inlays. |
| 05/10/1989 | CN2037493U Object demonstrator card of circuit diagram |
| 05/10/1989 | CN2037492U Demonstrator instrument for heat transfer test |
| 05/09/1989 | US4828787 Apparatus for simulation of the operation of a pressurized water nuclear reactor |
| 05/09/1989 | US4828501 Compact interactive training manikin system |
| 04/26/1989 | EP0313306A1 Apparatus for demonstrating and studying the operation of a fuel cell |
| 04/26/1989 | CN2036676U Student type spectroscope |
| 04/19/1989 | EP0311874A1 Mannequin for use in teaching cosmetology |
| 04/18/1989 | US4822285 Anatomically stuffed toy animal |
| 04/12/1989 | CN2035906U Audio and vidio demonstrator for conductivity fo cold liquid |
| 04/12/1989 | CN2035905U Teaching aid for displaying line and image of trigonometric functions |
| 04/11/1989 | US4821164 Process for three-dimensional mathematical modeling of underground geologic volumes |
| 04/05/1989 | CN2035520U Tester for centripetal force |
| 04/04/1989 | US4817937 Propulsion apparatus for a model of a flying object |
| 03/29/1989 | CN2035128U Electrode for imitating and describing equippotential lines of electrostatic field in constant current field |
| 03/29/1989 | CN2035127U High temperature superconduction display instrument |
| 03/29/1989 | CN1032084A Gravity type multifunction vibration synthesizer |
| 03/28/1989 | US4817039 Atmospheric controlled video simulation system |
| 03/28/1989 | US4815977 Breast-feeding trainer |
| 03/28/1989 | US4815975 Magnetically anchored dental prosthesis |
| 03/28/1989 | US4815900 Method for cutting slot in a head form |
| 03/22/1989 | CN2034727U Monolayer determinant eteetric circuit experiment board |
| 03/22/1989 | CN2034726U Model board for demonstration |
| 03/22/1989 | CN2034725U Combined model for mechanics experiment |
| 03/15/1989 | CN2034317U Simple vehicle simulation |
| 03/15/1989 | CN2034316U Demonstrator for geometry trigonometric functions |
| 03/15/1989 | CN2034315U Conical section demonstrator |
| 03/15/1989 | CN2034314U Multifunction mathematical ruler |
| 03/15/1989 | CN2034313U Combined geometric demonstrating teaching aid (inteligence toy) |
| 03/14/1989 | US4812128 Three-dimensional molecular model |
| 03/14/1989 | US4812127 Dental hygiene teaching tool and storage device |
| 03/14/1989 | US4812125 Interactive teaching apparatus |
| 03/09/1989 | WO1989001812A1 Doll |
| 03/08/1989 | EP0306328A1 Teaching device for artificial respiration |
| 03/08/1989 | CN2033931U Demonstrating instrument for photoelectric effect |
| 03/08/1989 | CN2033930U Demonstrating instrument used for electric knowlege |
| 03/08/1989 | CN2033929U Geometry intelligence spliting teaching aid |
| 03/07/1989 | US4810197 Three-dimensional instructional device for teaching physical properties and relationships between basic elements |
| 03/07/1989 | US4810196 Mannequin for use in teaching cosmetology |
| 03/01/1989 | CN2033531U Lorentz force demoustrating instrument |
| 03/01/1989 | CN2033530U Electromagnetic induction experimental facility |
| 03/01/1989 | CN2033529U Multifunctional experimental facility for enginecring hydro-mechanics system |
| 02/28/1989 | CA1250644A1 Method of making rock-pore micromodel involving generation of an accurate and reliable template image of an actual reservoir rock pore system |
| 02/22/1989 | CN2033146U Non-quantity of electricity measuring and displaying instrument |
| 02/15/1989 | CN2032752U Experimental device for resistance law |
| 02/15/1989 | CN2032751U Demonstrator for rigid body mechanics |
| 02/15/1989 | CN2032750U Comprehensive projection demonstrator for wave phase |
| 02/09/1989 | DE3725532A1 Locating source of electrical activity in human body - measuring biomagnetic signals taken without contact from which location of source is computed and on basis of model postulates sphere |
| 02/07/1989 | US4802858 Device for teaching treatment of skeleton injuries |
| 02/07/1989 | US4802857 CPR mask |
| 02/01/1989 | CN2031963U Electron cloud simulator |
| 02/01/1989 | CN2031957U Demonstration board for magnetic lines of force |
| 02/01/1989 | CN2031956U Wave motion demonstrator |
| 02/01/1989 | CN2031955U Equiangular protractor series |
| 01/31/1989 | US4801268 Manikin for practicing artificial respiration |
| 01/26/1989 | WO1989000416A1 Timing device |
| 01/25/1989 | EP0300412A1 Device for practizing artificial resuscitation |
| 01/25/1989 | CN2031554U Multiple purpose electrochemical experimental device |
| 01/25/1989 | CN2031553U Demonstrating device showing metal conductor resistivity changed with the temp. variation |
| 01/25/1989 | CN2031552U Folding plate capable of changing into many geometric figure |
| 01/24/1989 | CA1249368A1 Cardiopulmonary resuscitation prompting |
| 01/18/1989 | CN2031143U Comparator for electric conducting capacity of liquid |
| 01/18/1989 | CN2031142U Electron experiment box |
| 01/18/1989 | CN2031141U Electronic building blocks |
| 01/18/1989 | CN2031140U Displaying device for bending moment envelope diagram of simple supported beam |
| 01/18/1989 | CN2031139U 弹性碰撞装置 Elastic collision device |
| 01/18/1989 | CN2031138U Demonstrating and plotting instrument for simple harmonic vibration and sine curve |
| 01/11/1989 | CN2030740U Instrument of relation between circularity and angle |
| 01/10/1989 | US4797105 One-way breathing device |
| 01/10/1989 | US4797104 System and method of testing a person in the performance of cardiopulmonary resuscitation |
| 01/04/1989 | CN2030354U Automatic tracing apparatus capable of translational and parabolic motion |
| 01/04/1989 | CN1030151A Bronze figure morked with acupuncture points |
| 12/29/1988 | WO1988010484A1 Device for displaying operation of a microcomputer and method of displaying operation thereof |
| 12/28/1988 | CN88211451U Self sink and float device |
| 12/28/1988 | CN88211384U Training model for intubation of human trachea |
| 12/28/1988 | CN88206899U Combined mechanics experimental device |
| 12/27/1988 | US4794631 Cardiovascular phantom |
| 12/21/1988 | EP0296023A1 Method for analyzing and simulating the motions of a horse |
| 12/21/1988 | CN88212033U Plane and solid analytic geometry demonstrating model |
| 12/20/1988 | US4792306 Instructional device for teaching dental X-ray techniques |
| 12/20/1988 | US4791822 Cell assembly for determining conductivity and permeability |
| 12/20/1988 | CA1246863A1 Teaching aid for cpr |
| 12/13/1988 | US4790757 Instrument for practicing multiplication |
| 12/13/1988 | CA1246744A1 Simulator for use as a neurosurgical aid in determining potential paths for the implantation of probes through the human body |
| 12/08/1988 | DE3731323A1 Method and device for observing experimental operations on or in an operating object |