PL383550A1
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New derivatives of benzene- and pyridopyridazinones
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PL383303A1
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Sand painting
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PL383292A1
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Levitron
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PL383128A1
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Composite electro-magnetorheological material and its production method
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PL380778A1
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Unipolar engine
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PL376875A1
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Thermal engine
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PL371713A1
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Barometer
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PL361507A1
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Apparatus for mirage effect observation
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PL361508A1
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Cartesian diver
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PL359631A1
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Kaleidoscope
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PL359195A1
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Apparatus for modelling vibration of crystal lattice
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PL357398A1
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Servo-motor
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PL354107A1
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Device for modelling energy levels and transitions between them
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PL352885A1
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Apparatus designed to demonstrate capillarity
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PL352886A1
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Apparatus designed to demonstrate conversion of potential energy into kinetic energy of the rotary motion
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PL348838A1
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Magnetic board
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PL348840A1
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Device for demonstrating the forces acting on a rotating solid body
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PL348839A1
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Device for demonstrating the principle of conservation of momentum
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PL339065A1
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S-quinoline derivatives of thioles and method of obtaining them
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