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US3292595A
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Drafting pen
|
|
US3230574A
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Means for sealing a wick type marking device
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Protection of charcoal and pastel crayon drawings with coatings composed of copolymers of n-vinyl-2-pyrrolidone and vinyl acetate
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Writing implement
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GB808057A
|
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Improvements in or relating to lead pencils
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|
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|
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Lead pencil
|
|
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Wood encased pencil, lead therefor, and method of making same
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|
GB660784A
|
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Improvements in or relating to ball point writing instruments
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|
US2432061A
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Writing instrument
|
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US2504649A
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Ball point writing implement
|
|
US2573691A
|
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Writing instrument
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|
US2444004A
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|
Writing implement
|
|
US2444003A
|
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Writing implement
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|
|
Fountain pen
|
|
US2432012A
|
|
Writing pen
|
|
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|
|
Mechanical pencil
|
|
US2386948A
|
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Typewriter eraser
|
|
US2328143A
|
|
Fountain pen
|
|
US2331606A
|
|
Fountain pen
|
|
US2393222A
|
|
Rubberless flexible compositions and processes
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