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GB354006A
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Improvements in tangent screws for use with instruments of precision
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GB353178A
|
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Improvements in divided circles or arcs for use with surveying and other instruments of precision
|
|
GB353615A
|
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Improvements in trough compasses for use with surveying instruments
|
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GB338703A
|
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Improvements in surveyors' levels
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GB337570A
|
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Improvements in combined drawing board and tee square for geometrical drawing
|
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GB312513A
|
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Improvements in or relating to spirit levels
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GB244380A
|
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Improvements in or relating to spirit levels
|
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GB219821A
|
|
Improvements in surveyors levels
|
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GB212823A
|
|
An improved reflecting system for use with tubular spirit levels
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GB218060A
|
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Improvements in surveyors' levels
|
|
GB203459A
|
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Improvements in surveying instruments
|
|
GB185819A
|
|
Improvements in surveyors' levels
|
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GB186025A
|
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An improved spirit level for use in surveying instruments
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