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| Patents for B43K 21 - Propelling pencils (2,215) |
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| 02/27/1979 | US4141663 Jam-resistant lead feed mechanism for mechanical pencil | | 02/20/1979 | US4140408 Push type mechanical pencil | | 01/30/1979 | US4136980 Mechanical pencil | | 01/30/1979 | US4136431 Apparatus and method for inserting indicia into pens | | 08/15/1978 | US4106874 Mechanical pencil | | 05/23/1978 | US4091393 Automatic pencil apparatus for an automated drafting system | | 11/01/1977 | US4056325 Mechanical pencil | | 05/24/1977 | US4025204 Writing implement | | 03/29/1977 | US4015269 Automatic pencil apparatus for an automated drafting system | | 01/18/1977 | US4003664 Mechanical pencil with lead feed responsive to writing pressure | | 12/21/1976 | US3998558 Mechanical pencil | | 11/02/1976 | US3989392 Dispensing device | | 03/30/1976 | US3947133 Automatic pencil | | 03/23/1976 | US3945733 Mechanical pencil | | 02/17/1976 | US3939482 Writing apparatus |
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