U.S. federal trademark · Serial No. 74292279 · Reg. No. 1861642
improvement to an optical microscope which automatically keeps the specimen under the microscope in critical focus thus relieving a human operator from constantly searching for and maintaining focus; namely, a sensor that determines how far the sample is out of focus along with and electric motor which replaces the hand of a human operator and rotates the focus knob in the proper direction to achieve critical focus
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