TY  - BOOK
AU  - J.G CHOWTHER
TI  - DISCOVERIES AND INVENTIONS OF THE 20TH CENTURY
U1  - 608/CRO 
PY  - 1955///
CY  - LONDON
PB  - ROUTLEDGE & KEGAN PAUL
KW  - INVENTIONS & PATENTS
KW  - TECHNOLOGY
ER  -