21. A prototype system charging electric vehicles has been in operation at University of British Columbia since 2012. 22. With other improvements, a full prototype system was first tested at sea on the in April 1937. 23. Program activities extend from fundamental investigations, through simulation and analysis, to design and field testing of prototype systems . 24. SDR also has prototype systems for other government functions such as liquor control and professional and business licensing. 25. The company has already begun supplying prototype systems for medical imaging that offer an alternative to X-ray film. 26. This 4G prototype system also uses a 12x12 antenna MIMO configuration, and turbo coding for error correction coding. 27. The 8-level code used on the prototype systems is a convolutional code, storing about 2.5 bits per data cell. 28. The prototype system is activated after a green light signals the driver to pull up to the credit-card station. 29. At that meeting, Tackbary demonstrated a prototype system and told company officials she had filed for a patent application. 30. But the prototype system now being tested has not yet been shown to be sufficiently reliable to protect American cities.
