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2x ALRO oil Spill and drilling slide charts 1980 Holland
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2x ALRO Oil Spill and drilling slide charts, made around 1980 in Holland
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Description
Interesting set of 2 slide charts both made by ALRO from Holland (but not signed), both in English. The yellow one is made for the Dutch company SHELL to give the hydraulic relations in drilling as well as the optimum drilling technique and other related information. The blue one was made for the Dutch Government and covers the effects of an oil spil over time in spreading and dispersion under various conditions and in different types of water. They are fully functioning with all parts intact. They both measure ca. 25 cm or ca. 10 inches wide. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
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