Silicium 1958
53. 1959-12-06 Silicium

53. 1959-12-06 Silicium

54. 1961-09-18 silicium

54. 1961-09-18 silicium

55. 1961-09-18 silicium production

55. 1961-09-18 silicium production

56. 1961-09-18 Siliciumkristallen trekken

56. 1961-09-18 Siliciumkristallen trekken