Librería Samer Atenea
Kálamo Books
Librería Elías (Asturias)
Librería Kolima (Madrid)
Librería Proteo (Málaga)
The monograph, based on the results of comparative production tests of a modernized sewing machine equipped with a pusher with conical springs, compared with existing designs, eliminates problems with skipped stitches, material folds, thread breakage and needle breakage, and also smooths out the gathers that occur when sewing materials.