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The first mini-split system was sold in 1961 by Toshiba in Japan, and the first wall-mounted mini-split air conditioner was sold in 1968 in Japan by Mitsubishi Electric, where small home sizes motivated their development. The Mitsubishi model was the first air conditioner with a cross-flow fan.
While many guides discourage using an apostrophe in all numbers/dates, [74] many other guides encourage using an apostrophe for numbers or are divided on the issue; for example, the Australian Government Style Manual recommends "Binary code uses 0’s and 1’s" but recommends "the 2020s". [75] Still other guides take a laissez-faire approach.