000
003090000a22001330004500
245
_a
Cobblestone June 1994
260
_c
6/1/1994
650
_a
Women Inventors
650
_a
Inventions
650
_a
Patent
650
_a
Margaret E. Knight
651
_x
Hedy Lamarr
852
_o
J PER
999
_c
44120
_d
44120