The Encyclopedia Americana, Volume 7Grolier, 1994 - Encyclopedias and dictionaries |
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Page 138
Where roof support is required ( as is often the case in weak shale ) , the overhead rock may be held in place by timber props , rock bolts , or other means . Artificial support is limited where possible to permanent openings .
Where roof support is required ( as is often the case in weak shale ) , the overhead rock may be held in place by timber props , rock bolts , or other means . Artificial support is limited where possible to permanent openings .
Page 439
... The " dictatorship of the proletariat " in practice means the rule by force of the Communist party and its leaders , which destroys individual freedom and true representative government . ( 4 ) The idea of " world revolution " is an ...
... The " dictatorship of the proletariat " in practice means the rule by force of the Communist party and its leaders , which destroys individual freedom and true representative government . ( 4 ) The idea of " world revolution " is an ...
Page 484
Boolean algebra is an alge- bra of logic , in which the multiplication sign ( • ) 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 ...
Boolean algebra is an alge- bra of logic , in which the multiplication sign ( • ) 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 ...
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