File:Fig. 3 - Wingmatic pen (1959-04-14).jpg
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![File:Fig. 3 - Wingmatic pen (1959-04-14).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/65/Fig._3_-_Wingmatic_pen_%281959-04-14%29.jpg/447px-Fig._3_-_Wingmatic_pen_%281959-04-14%29.jpg?20210228041559)
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