TY  - BOOK
ED  - Govt. of India
TI  - Patents for inventions abridgment of specification 3000 - 35000
U1  - 608.754 
PY  - 1957///
CY  - Delhi
PB  - Govt. Press
N1  - Group II. - Sanitation (1) Closets, baths and like sanitari applicances.(2) Drains and Sewers.(3)Sewage, treatment of.(4)Water and unspecificafied liquids, purifying and sottenry
ER  -