who was the microscope invented by
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who was the microscope invented by
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when was the microscope invented
who invented the first microscope
when was the first microscope invented
when was the electron microscope invented
who invented the electron microscope
who was the microscope invented by, who invented the microscope, when was the microscope invented, who invented the first microscope, when was the first microscope invented, when was the electron microscope invented, who invented the electron microscope