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coarse adjustment knob microscope function
coarse knob function microscope
course adjustment knob microscope function
coarse focusing knob microscope function
coarse focus knob microscope function
fine adjustment knob microscope function
coarse focus knob on microscope
the course adjustment knob on the microscope
coarse adjustment knob microscope function, coarse knob function microscope, course adjustment knob microscope function, coarse focusing knob microscope function, coarse focus knob microscope function, fine adjustment knob microscope function, coarse focus knob on microscope, the course adjustment knob on the microscope
