TY  - BOOK
AU  - Holt, Michael
TI  - Inventions
T2  - Belitha information library
SN  - 1855610140
U1  - 000 
PY  - 1990///
CY  - London
PB  - Belitha Press Limited
N2  - Explains the nature of inventions and patents. Discusses major inventions in the past such as the telephone, radio, the first aeroplane, the electric generator and goes back in time to early tool-making and development of the wheel and sailing ship. Suggested level: intermediate, secondary
ER  -