US3525573A
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Writing,painting or drawing utensil with a moist nib
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GB936464A
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Multi-colour pen or pencil
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GB774856A
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An improved writing instrument
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US2184911A
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Pressure feed pencil
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GB482097A
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Improvements in and relating to writing implement having interchangeable leads
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US2113320A
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Selective multiple lead pencil
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GB478118A
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Improvements in and relating to magazine lead pencils with selectively interchangeable lead holders
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US2136290A
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Interchangeable lead pencil
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