US1096275A
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Pneumatic type-writer.
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GB191317619A
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Improvements in and relating to Typewriters.
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GB191300136A
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Improvements in and relating to Printing Mechanism for Pneumatically Operated Typewriters.
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GB191300135A
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Improvements in and relating to Pneumatically Operated Typewriters.
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US947688A
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Pneumatically-operated type-writing machine.
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US914464A
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Method of and apparatus for duplicating type-written documents.
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GB190708017A
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Improvements relating to Typewriting Duplicators.
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GB190427616A
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Improvements in and relating to Pneumatic Typewriters.
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GB190223289A
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Improvements in or relating to Type-writing Machines.
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CA74964A
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Pneumatic typewriter
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GB190016249A
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Improvements in Pneumatic Type-writers.
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US676590A
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Type-writer.
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