Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
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.