GB522314A
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Improvements in or relating to record card controlled calculating machines
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GB520692A
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Improvements in or relating to record controlled typewriting mechanism
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GB514780A
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Improvements in or relating to calculating machines
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GB497588A
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Improvements in or relating to calculating machines
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GB484911A
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Improvements in or relating to record card controlled tabulating machines
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GB477367A
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Improvements in or relating to sheet feeding mechanism for statistical and like machines
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GB475901A
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Improvements in or relating to analysing mechanism for statistical card sorting machines
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GB463487A
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A portable projector for opaque pictures
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GB462357A
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Improvements in or relating to machines for arranging statistical cards in a predetermined order
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GB454857A
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Improvements in and relating to printing mechanism for calculating machines
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GB440116A
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Improvements in or relating to guides and supports for typewriter ribbons
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GB428316A
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Improvements in or relating to devices for controlling the operations of a machine
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GB422344A
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Improvements in or relating to paper feeding mechanism for statistical and like machines
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GB409762A
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Improvements in or relating to ink ribbon mechanism for typewriters and like machines
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