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FR2747326A1
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New method of eliminating graffiti from solid surfaces
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FR2747325A1
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Treatment of exposed rigid surfaces to prevent graffiti
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FR2706413A1
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Unified process of propulsion - piloting of airships in annihilation of lateral thrust of the winds and autonomy of ballasting.
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FR2681306A1
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Lift method for lighter-than-air machines, with independence of ballasting
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DE2253857A1
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ENTRY MANHOLE BOTTOM PART FOR UNDERGROUND SEWER PIPES
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FR2197445A5
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Flexible pipe couplings with rigid casings - made from moulded coatings of fibre reinforced cement or resin
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