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John Tough
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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
(AREA)
Abstract
25,066. Tough, J. Nov. 18. Compasses, drawing.-In pencil attachments and the like of the type shown, the externally-threaded disc f screws in the internally - threaded hollow piece a, slots a<3> being formed so that the disc can be gripped by the fingers.
GB190425066D1904-11-181904-11-18Improvements in Drawing Compasses.
ExpiredGB190425066A
(en)