INDUS.P-EC (
Industriemuseum) (1946)55,58; (1948)185; (1949)217,223,225,233; (1950)244-252,254,259,262,269,274-280,283-287,291,295-296; (1951)297,307,308,313,316,317,323,337,342,343; (1952)352,353,356,361,365,371,376,378,382,388,395; (1953)400,404,406,408,411,413,415,416,418,419,422,432,436,441,444; (1954)453,457,464,470,478,484,485,491,496-499; (1955)508,513,514,523,527,528,531,537,539,541,546-548,550,552-554; (1956)558,560,565,567,569,570,572,573,588,591; (1957)627,639-644,650,653-655; (1958)684,693-699,705-707,709; (1959)713,717,718,721,723,725,727,735,741,749,751,754,755,761-763; (1960)771,783. ONTBREEKT : (1950)247; (1957)643.