The Encyclopedia Americana, Volume 7Grolier, 1992 - 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 several ...
... 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 several ...
Page 238
... means of production and distribution belong to the people collective- ly . Ownership is vested in a group , most often the state . The term is also applied to the theory that society should be so organized . For examina- tions of ...
... means of production and distribution belong to the people collective- ly . Ownership is vested in a group , most often the state . The term is also applied to the theory that society should be so organized . For examina- tions of ...
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 A ( 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 A ( not A ) . Thus , if a switch represents A when closed ...
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