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PL349167A1
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Method of and apparatus for compressing gases
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PL340067A1
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Method of adapting a bore-hole to installation of a bore-hole-mounted heat exchanger
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PL339387A1
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Method of protecting land area surrounding a bore-hole against migration of gas
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PL333756A1
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Method of and filter for filtering off sand in sandy gas or oil mining bore-holes
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PL333551A1
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Method of isolating sulphur in redox-type processes for removing hydrogen sulphide from gases
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PL328839A1
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Breath valve
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PL319200A1
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Method of exploiting low-productivity earth gas production bore-holes being fooded with ground water
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PL319056A1
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System for dispensing liquids by gravity
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PL319057A1
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Small-diameter service conduit
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PL313678A1
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System for measuring gas pressure and temperature aqs well as for handling pulse outputs from gas meters
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PL313400A1
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Power supply unit circuit arrangement
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PL313401A1
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Microprocessor-controlled pulse logger
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PL312892A1
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Method of making a leak-tight pack of dry cells and pack of dry cells made using that method
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PL312540A1
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Measuring and telemetric system for earth gas pressure reducing and flow metering stations
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PL312389A1
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Metering valve
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PL311804A1
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Apparatus for protecting a gas valve against unauthorised opening
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PL308012A1
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Elevator for lifting casings
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PL304747A1
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Conical plug valve
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PL296532A1
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Annular seal for high-pressure gate valves
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PL295086A1
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Roofing sheet metal fastener
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