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Manufacturing helical spring from band, comprises arranging sectors of ring gear from top to bottom according to periodic design, passing the band around folding segments having first and second slopes, and folding the ring gear sectors
Номер патента: FR2900585A1. Автор: Alain Blanc,Philippe Martel. Владелец: PEUGEOT CITROEN AUTOMOBILES SA. Дата публикации: 2007-11-09.