Bidspirit auction | signed Ritscher, 1st half of

signed Ritscher, 1st half of th - signed Ritscher, 1st half of the 20th century, group of 4 charcoal drawings with motifs from mining, industry and car factory, each charcoal on paper, signed lower right, traces of age, 48 x 37 cm, each mounted in passepartout, 65 x 50 cm