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The purpose of this paper is to examine a particular aspect of the history of the watchmaking industry during the eighteenth century. Attention is drawn to overlooked ideas and inventions and how years later they may become profitable business opportunities for entrepreneurs. The approach adopted allows examination of the development and commercialisation of a watch escapement mechanism, the rack lever, within the context of the development of other escapements. The rack lever was an escapement which was initially overlooked in the early part of the eighteenth century but which many decades later was reinvented and became a commercial success in the early nineteenth century.

Reference is made to the literature on entrepreneurship and acquisition of knowledge in the eighteenth century and the nature of watchmaking in the same epoch. The literature on …