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DE3728971A1
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Method and devices for improved shunting for rail goods traffic
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Hydroelectric power-generating systems
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Hydraulic drive for two-wheeled vehicles
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Method and apparatus for producing deep earth bores
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Method and device for artificial development and extraction of geoheat in industrially useable form
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Rotary IC engine operating method - is improved by auxiliary piston which controls opening and closing of auxiliary chamber
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Door lock allowing emergency keyless operation - has gear connected countersunk screws providing combination release for cylinder lock if key is lost
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Manual propulsion for becalmed sailing dinghy - with elastic end edge to rudder for low turbulence as bar is swung to and fro
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GB1210649A
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Improvements in or relating to teaching machines
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