Title:
Face mask for use in dust-laden or other contaminated conditions
United States Patent 2792000


Inventors:
John, Richardson Richard
Application Number:
US40453854A
Publication Date:
05/14/1957
Filing Date:
01/18/1954
Assignee:
B S F A HOLDINGS LTD
Primary Class:
Other Classes:
128/207.13
International Classes:
A62B18/02
View Patent Images:
US Patent References:
2764152Mask for applying gases1956-09-25
2468383Nasal and sinus protector and warmer1949-04-26
1191274N/A1916-07-18
0771801N/A1904-10-11
0428592N/A1890-05-27
Foreign References:
GB492723A1938-09-26