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If you want to see where the global AI buildout is really spending its money, the machine-tool order book is the most honest ledger. Toyo Keizai's data are blunt: Japan's May machine-tool orders broke 177 billion yen, the fourth-highest month ever, powered not by consumers or traditional autos but by AI, semiconductors and data centers. The key figure is the record order backlog - orders booked but not yet delivered - which means makers have sold out future capacity, a classic late-cycle capex signal. With aerospace, shipbuilding and transport machinery also surging, this is a cross-industry investment wave, not a single hot theme. The warning the report flags is lengthening lead times: when every customer orders at once, delivery slips past a year, threatening Japan's reliability edge and pushing impatient buyers toward Taiwanese, Korean or Chinese alternatives. For Taiwan, three takeaways: upstream suppliers of rails, ball screws and controllers ride the tailwind; buyers should price in year-plus lead times and higher quotes; and machine-tool orders remain one of the earliest dashboards for global manufacturing capex. The swing factor sits not in Japan but in US cloud giants' capex guidance - the source water for this entire chain.