The Encyclopedia Americana, Volume 7Grolier, 1995 - Encyclopedias and dictionaries |
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Page 138
... means . Artificial support is limited where possible to permanent openings . " " The long - wall system has limited use in the United States . The coal is " won , ' or mined , from a face of coal which may be a few hundred feet to ...
... means . Artificial support is limited where possible to permanent openings . " " The long - wall system has limited use in the United States . The coal is " won , ' or mined , from a face of coal which may be a few hundred feet to ...
Page 436
... means of production - patricians in Rome , feudal lords in medieval times , the bourgeoisie ( employers and property owners ) in an industrial society - and a class of exploited that made efforts to bring about a more equal distribution ...
... means of production - patricians in Rome , feudal lords in medieval times , the bourgeoisie ( employers and property owners ) in an industrial society - and a class of exploited that made efforts to bring about a more equal distribution ...
Page 484
... means AND , " the addition sign ( + ) means “ OR , " and a bar over any symbol means " NOT . ” An affirmative statement , such as A , can there- fore be expressed negatively as à ( not A ) . Thus , if a switch represents A when closed ...
... means AND , " the addition sign ( + ) means “ OR , " and a bar over any symbol means " NOT . ” An affirmative statement , such as A , can there- fore be expressed negatively as à ( not A ) . Thus , if a switch represents A when closed ...
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