Helen Besi ... Superseded ... 1965 ... PD 1440-8 (DA 4933) ... PD 1440-8
Helen Besi ... Dirty Heavy Tracing Paper Drafting Ink ... 1965 ... PD 1440-2 (DA 5041) ... PD 1440-2
Helen Besi ... Side view and upper part with handle ... 1965 ... PD 1440-10 (DA 5046) ... PD 1440-10
Helen Besi ... Dirty Heavy Tracing Paper Drafting Ink ... 1965 ... PD 1440-12 (DA 5042) ... PD 1440-12
Helen Besi ... Dirty Heavy Tracing Paper Drafting Ink ... 1965 ... PD 1440-11 (DA 5043) ... PD 1440-11
Helen Besi ... Dirty Heavy Tracing Paper Drafting Ink ... 1965 ... PD 1440-9 (DA 5047) ... PD 1440-9
Helen Besi ... Dirty Heavy Tracing Paper Drafting Ink ... 1965 ... PD 1440-4 (DA 6304) ... PD 1440-4
Helen Besi ... Dirty Heavy Tracing Paper Drafting Ink ... 1965 ... PD 1440-7 (DA 6312) ... PD 1440-7
