Babies dummy is holed for inside and outside pressure balance in use and holed for cleaning after parent-alerting time interval.
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Teaching aid has transverse axle turning on base plate, with axle, weights, brake and guide.
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School and university teaching aid with base plates
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Teaching aid for demonstrating circular motion
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Teaching aid for school and university
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Teaching aid machine with displaceable centre of gravity
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Principle which indicates how the energy stored in an accelerated circular motion can be re-stored into a translatory motion, and a drive resulting therefrom for space vehicles
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Reactive drive for accelerating and manoeuvring space vehicles
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Drive for accelerating and manoeuvring spacecraft
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Drive unit for acceleration and manoeuvre of space vehicles
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Closure for tubes and dispensers of pastes, in particular toothpastes, having a housing
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Cigarette box with hinged lid and pattern for its production
