Household sewing-machines; testing of loss of tensile strength of needle thread by sewing
家用缝纫机；缝纫时针线抗拉强度损失的测试

1972-05-01

家用缝纫机 送料方向稳定性测试方法
Household sewing machine—Determination of directional stability

2013-12-31

HOUSEHOLD SEWING MACHINES. DETERMINATION OF DIRECTIONAL STABILITY (DRIFT)
家用缝纫机 方向稳定性（漂移）的测定

1985-06-15

HOUSEHOLD SEWING MACHINES. DETERMINATION OF DIRECTIONAL STABILITY (DRIFT)
家用缝纫机 方向稳定性（漂移）的测定

1986-07-15