Abstract: A telephone communication system (10) utilizes a computer controlled PABX (12) which connects telephone trunk lines (13) to a voice response computer (50). The PABX (12) includes an automatic call distribution unit (12a) which provides selected call control and monitoring features. The ACD unit (12a), however, works only into digital control telephone lines while the voice response computer (50) works only with conventional two-wire telephone lines. Incoming telephone calls are transmitted through the trunk lines (13) to the automatic call distribution unit (12a). These calls are routed through a digital control telephone line (18) to a telephone set (24). A register (34) together with a make busy circuit (38) operate the telephone set (24) when one of the telephone lines (40) is available.

Abstract: A coarse focus mechanism for microscopes and related instruments wherein the mechanism includes a slip clutch operated knob which rotates a pinion shaft for moving either the optical or stage member of the microscope relative to the other member for achieving a coarse focus. The knob is disposed on the pinion shaft between the slip clutch and an abutment which is laterally adjustable along the longitudinal axis of the pinion shaft for precisely positioning the knob on the pinion shaft. The knob may include a removable protective housing for enclosing the slip clutch mechanism.