Here's how Shimano sold the groupset in its first every brochure for Dura-Ace: 'The Dura-Ace series is a full line of high-quality components, featuring the most advanced engineering and performance possible. Each is manufactured of special light weight extra strong "micro-alloys". Shimano's unique cold forging process adds that extra degree of strength and precision. The Dura-Ace line's exquisite jewel finish characterises the extra care and craftsmanship that goes into each and every component.
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