| 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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| 10/31/1990 | CN2064919U Observation instrument for teaching experiment demonstration |
| 10/31/1990 | CN2064918U Plugging <<solid geometry>> figure demonstrator |
| 10/31/1990 | CN2064917U Removable and extendible geometric mould with inlaid clamp |
| 10/24/1990 | CN2064512U Positive and negative charges' displays |
| 10/23/1990 | US4964803 Device for displaying operation of a microcomputer and method of displaying operation thereof |
| 10/21/1990 | CA2014837A1 A motorcycle accident simulating test dummy |
| 10/17/1990 | CN2064087U Constant temperature chemical reactor |
| 10/10/1990 | EP0391397A1 Education hydraulics device |
| 10/10/1990 | CN2063677U Energy-saving hg-na spectra demonstrating apparatus |
| 10/10/1990 | CN2063676U Moment disc for directly measuring force arm |
| 10/04/1990 | DE3910538A1 Device for learning how to clean teeth |
| 10/03/1990 | CN2063267U Experimental facility for refractivity of transparent plate |
| 10/03/1990 | CN2063266U Comprehensively combined teaching aid for hydraulics |
| 10/03/1990 | CN2063243U Projector for uniform-speed circular motion |
| 10/03/1990 | CN2063230U Safety measurer for atmospheric pressure |
| 10/02/1990 | US4961154 Three dimensional modelling apparatus |
| 09/26/1990 | CN2062888U Combined teaching aids for demonstrating trace of relative motion |
| 09/19/1990 | CN2062480U Demonstration instrument for the three original colours |
| 09/19/1990 | CN2062479U Electric mechanical driving combined teaching tools |
| 09/19/1990 | CN1045476A Method for making specimens |
| 09/12/1990 | CN2062097U A.c. boiler demonstration device |
| 09/05/1990 | CN2061723U Modified structure of electrolytic tank for tester of electrolysis or synthesis of water |
| 09/05/1990 | CN2061722U Optical demonstrator for primary school |
| 09/05/1990 | CN2061721U Teaching appliance for geometry |
| 08/29/1990 | CN2061316U Multiterminal heart auscultation human body simulated device |
| 08/22/1990 | EP0383697A2 Electrocardiographic process simulator |
| 08/22/1990 | EP0383422A2 Jaw model |
| 08/21/1990 | US4950197 Modular rotary motion toy |
| 08/21/1990 | US4950166 Educational kit for fast cycling plants |
| 08/16/1990 | DE3936572A1 Eye-securing instrument for examination - has transparent support sealed in bottom component and annular enclosing bead above |
| 08/15/1990 | CN2060581U Chemical test displaying box of middle school |
| 08/15/1990 | CN2060580U Coincidence extent display for cylindrical bearing drive |
| 08/15/1990 | CN2060557U Simple lamp basement |
| 08/15/1990 | CN2060398U Strain stress compasses |
| 08/14/1990 | US4948373 Structural model of the human craniomandibular system |
| 08/07/1990 | US4947474 Mechanism of observation and recording operation on an object |
| 08/07/1990 | US4946388 Dental articulator mounting for dental casts |
| 08/02/1990 | DE3900006C1 EEG learning head model |
| 08/01/1990 | EP0380310A2 An acoustic analysis device and a frequency conversion device used therefor |
| 08/01/1990 | EP0263062B1 Method and apparatus for recording and/or evaluating the mobility of laboratory animals |
| 08/01/1990 | CN2060004U Demonstrator for magnetic induction of line current |
| 07/31/1990 | US4945476 Interactive system and method for creating and editing a knowledge base for use as a computerized aid to the cognitive process of diagnosis |
| 07/31/1990 | US4944681 Plush toy with ear system for displaying normal and abnormal eardrums |
| 07/31/1990 | US4944680 Artificial denture-skull for dental purposes |
| 07/25/1990 | EP0379432A1 Method for the polychrome graphical representation of the depositional slope of geological layers |
| 07/25/1990 | CN2059754U Tester for triboelectrification |
| 07/24/1990 | US4943821 Topological panorama camera |
| 07/24/1990 | US4943238 Automotive electronic instructional and diagnostic training apparatus |
| 07/18/1990 | CN2059527U Telecontrolled rotating demonstrator |
| 07/18/1990 | CN2059500U Three-freedom gyro |
| 07/11/1990 | CN2059263U Experiment instrument for sodium spectrum |
| 07/10/1990 | US4940412 Method of manufacturing anatomical models |
| 07/04/1990 | CN2059010U Vertical electric power magnetic power line display board |
| 07/04/1990 | CN2059009U Teaching-aid for ratio of the circumference |
| 07/04/1990 | CN1043582A Bolt linked complex measuring device |
| 07/03/1990 | US4938696 Model demonstrating human organ systems |
| 06/27/1990 | CN2058779U Electro-optical demonstrating model for left-hand and right-hand rules |
| 06/27/1990 | CN2058778U Electron charge mass ratio testing instrument |
| 06/27/1990 | CN2058777U Atmosphere demonstrating and determinating device |
| 06/20/1990 | CN2058519U Vertical multifunctional experiment device for hydraulics |
| 06/20/1990 | CN2058518U Sucker combined type teaching aid for plane analytic geometry |
| 06/19/1990 | US4935887 Process and analysis and simulation of the displacements of a horse |
| 06/19/1990 | US4934940 Dental hygiene instruction display |
| 06/14/1990 | WO1990006569A1 Didactic apparatuses and method for teaching and representating particularly orbital phenomena and various motions |
| 06/13/1990 | DE3840473A1 Knee joint prosthetic components as replacement for the cruciate ligaments |
| 06/13/1990 | CN2058263U Demonstration device for teaching cohesive force |
| 06/13/1990 | CN1043027A Plant desiccating method and handicrafts produced |
| 06/12/1990 | US4932879 Compact interactive training manikin system |
| 06/06/1990 | CN2058029U Drawing model three-sided view projection imaging apparatus |
| 05/31/1990 | WO1990005971A1 Internal environment simulator system |
| 05/30/1990 | CN2057773U Demonstrating unit for buoyancy principle |
| 05/23/1990 | CN2057526U Chemical experiment box for middle school students |
| 05/23/1990 | CN2057525U Demonstrator for current flow in conductor |
| 05/23/1990 | CN2057524U Experiment apparatus for magnetic and optical effect |
| 05/23/1990 | CN2057523U Measurer for pressure intensity, buoyancy force, specific gravity of liquid |
| 05/17/1990 | WO1990005351A1 Manipulatable, spherical educational and amusement devices |
| 05/08/1990 | US4922758 Cell assembly for determining conductivity and permeability |
| 05/08/1990 | CA1268625A1 Device for teaching treatment of skeleton injuries |
| 04/25/1990 | CN2056536U Demonstrator for centripetal force |
| 04/19/1990 | WO1990004244A1 Anthropomorphic cardiac ultrasound phantom |
| 04/18/1990 | CN2056269U Portable collapsible radio demonstration teaching board |
| 04/17/1990 | US4917607 Doll for facilitating therapeutic communication and attitudinal healing |
| 04/17/1990 | US4917117 Process and apparatus for the recording and/or evaluation of the movement behavior of experimental animals |
| 04/13/1990 | CA2000656A1 Anthropomorphic cardiac ultrasound phantom |
| 04/12/1990 | DE3834553A1 Coloscopy simulator |
| 04/11/1990 | CN1041233A Radiation detection training apparatus |
| 04/10/1990 | US4915635 Compact interactive training manikin system |
| 04/10/1990 | US4915626 Dental inspection and display apparatus |
| 04/04/1990 | CN2055626U Ear acupuncture point model |
| 04/04/1990 | CN2055625U 元素周期仪 Elements of the periodic instrument |
| 03/28/1990 | CN2055282U Double-slit interferance simulating instrument |
| 03/28/1990 | CN2055281U Multipurpose electricity clemonstration plate for junior-middle-school physics teaching |
| 03/28/1990 | CN1040877A Analy teaching aid |
| 03/21/1990 | CN2054924U Solid geometry display apparatus |
| 03/21/1990 | CN2054923U Learning aid with changable coordinate axis |
| 03/13/1990 | US4907973 Expert system simulator for modeling realistic internal environments and performance |
| 03/07/1990 | EP0357371A2 Improvements in, or relating to, dental oral stimulators |
| 03/07/1990 | EP0357158A1 A toy building element with elements for providing positional information |
| 03/07/1990 | CN2054186U 多功能光学教学玩具 Multi-functional optical Educational toys |
| 03/06/1990 | US4906122 Coupling for molecular models |