US1255706A
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Process and apparatus for casting compound metal units.
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CA171157A
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Floor or ceiling
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GB191113956A
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Improvements in Hollow Building Bricks.
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GB191105478A
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Improvements in Floors and Ceilings.
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GB191101732A
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Apparatus for Making Hollow Building Blocks.
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US1149180A
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Construction of buildings.
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US986798A
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Method of making hollow building-blocks.
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US1047614A
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Building-block.
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GB191112482A
|
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Improvements in Floors and Ceilings.
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US1029530A
|
|
Blocks for building construction.
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US983534A
|
|
Hollow building-block.
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US986132A
|
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Sectional building-block.
|
US978003A
|
|
Apparatus for making hollow building-blocks.
|
US978002A
|
|
Block for building construction.
|
US982030A
|
|
Building construction.
|
GB190806924A
|
|
Improvements in Floors and Ceilings
|
US875318A
|
|
Flooring.
|