TY  - BOOK
TI  - Canadian Patent 
U1  - 697.92 
PY  - 1966///
CY  - New York : 
PB  - The Patent Office, 
KW  - Heating and Ventilating
N1  - NN; Pt. 5. Combination Aiir Dust and Girder for Hot Air Ventilating System No 738.194
ER  -