ถุงมือหนังอุตสาหกรรม อุปกรณ์เซฟตี้ที่ช่างต้องมี

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สปริงกด (Compression Spring)

??????? ?????????????????????? ??????????????? ??? ?????? ????? ????? ?????          ??????? ???? ???????? ?????????????????????????????????????? ????? ?????? ????????? ??????????????????????????????????? ???????????????????????????????????????????????????????????????????????????????????????? ?????????????????? pitch ??? ????????????????

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สปริงกด (Compression Spring)

??????? ?????????????????????? ??????????????? ??? ?????? ????? ????? ?????          ??????? ???? ???????? ?????????????????????????????????????? ????? ?????? ????????? ??????????????????????????????????? ???????????????????????????????????????????????????????????????????????????????????????? ?????????????????? pitch ??? ????????????????

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