The electric pen, the centerpiece of the complete duplicating system, boasted a sleek and ergonomic design. Its cast-iron body, commonly adorned with black japanning and gold striping, exuded a sense of elegance and durability. The pen itself featured a motor mounted on top, connected to a pen-like shaft. Powered by a wet-cell battery, the motor… Continue reading Unveiling the Ingenious Invention: The Electric Pen