I'm not sure if you need it anymore, but just in case =/.
The evolution of one’s knowledge in science often parallels the invention of instruments that extend the human senses to new limits. With the invention and developments of the microscope scientist were able to carefully observe cells. The development of the light microscope allowed for the observation that all living things were made up of cells; unicellular organisms were discovered. Furthermore, the introduction of different staining and cell preparation techniques allowed scientist to observe various organelles of a cell. Through staining, cell division could be observed.
In 1933 Ernst Ruska built the first electron Microscope, enabling more detailed observations of all structures to be made. This allowed us to observe various organelles which could not be viewed under a light microscope.
In all, technological advancements have helped many scientist gain a greater understanding of cell and tissue structure and in turn has aided the development of the cell theory.