I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "At the beginning of 1893 Westinghouse engineer Benjamin Lamme had made great progress developing an efficient version of Tesla's induction motor and Westinghouse Electric started branding their complete polyphase phase AC system as the "Tesla Polyphase System", noting how they believed Tesla's patents gave them patent priority over other AC systems."? 

When in 1893 did this occur?