Methods of making and using polyurea elastomers are disclosed. The balance control sensor provides a balance signal corresponding to an orientation of the robotic cane. Additionally, the data may be read from and loaded into the memory devices tofrom the sets of shift registers such that the shifting of the shift registers is uninterrupted during the reading andor loading of data. The system is designed to substantially filter light so that the light does not interfere with NVGs. The dust collector includes: a dust collector body, a number of filter bags, a moving compressed air tank, nozzles, diaphragm valves, mechanical 3-way valves, protrusions, a reduction motor and a mechanical device for driving the compressed air tank, and an inverter controller.