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US2334404A
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Apparatus for solving problems
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Apparatus for solving mathematical problems
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Apparatus for use in solving mathematical problems
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Apparatus for building structures
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Method of erecting structures
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Method of constructing buildings
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Method of building floor and roof structures
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Form panel and apparatus for use therewith
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GB391449A
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Improvements in structures and a method of and means for forming the same
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Method of building walls
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Apparatus for building walls
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Structure
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Method of making structures
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Building wall construction
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Method of building walls
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Concrete wall construction
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