A content-addressable memory circuit includes a first local bit line coupled to a first memory location, a second local bit line coupled to a second memory location, a global bit line coupled to the first and second local bit lines and a global bit line accelerator coupled to the first and second local bit lines and the global bit line. The method comprises converting a first signal having three components into a second signal having two components in accordance with a first transformation, wherein each component of the first signal corresponds to a phase component of a three-phase electrical signal and the two components of the second signal are representative of characteristics of the three-phase electrical signal. The method further includes generating, based on the image data, three-dimensional model data representative of the body part, and generating parametric CAD model data of the orthotic device based on the three-dimensional model data and the patient information. Rotational motion of a control button of the operating mode change-over switch is converted to axial displacement of the actuator ring on the hammer tube by the switching mechanism. The locking member may have an element adapted to engage the at least one structural feature in the support rail. A processor receiving the indicating data from the sensing device then determines a determined signature part and authenticates the product item by comparing the received signature part and the determined signature part.