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FR2582319A1
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Nickel deposit system by vacuum evaporation, particularly for the preparation of neutron guides
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FR2476595A1
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Landing light for airport runway - avoids damage when surrounding water freezes by allowing air retained in peripheral cavity to compress
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FR2452725A2
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Determining rotation of digital auto-collimator - uses internal mirrors to direct return image over photodiode detector array
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FR2419497A1
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Anti-aircraft optical aiming device - has laser emitter between image erecting and transmission devices
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GB1592707A
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Shadowless lighting appliance
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US807338A
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Motor operating with heavy hydrocarbons.
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US812103A
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Light-projector.
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