|
GB537658A
|
|
Improvements in thermionic device
|
|
US2194167A
|
|
Thermionic device
|
|
US2180714A
|
|
Thermionic device
|
|
US2253862A
|
|
Cleanup agents
|
|
US2210308A
|
|
Iron alloy suitable for electrical resistances
|
|
US2210309A
|
|
Iron alloy suitable for electrical resistances
|
|
GB492529A
|
|
Improvements in or relating to the production of high vacua
|
|
US2126686A
|
|
Production of high vacuum
|
|
GB428964A
|
|
Improvements in or relating to clean-up agents or getters
|
|
US2018965A
|
|
Clean-up agent
|
|
DE667834C
|
|
Magnesium alloy
|
|
GB404220A
|
|
Improvements in or relating to magnesium alloys
|
|
US1979452A
|
|
Magnesium alloy
|
|
US1974060A
|
|
Alloy and article composed of same
|
|
US1963844A
|
|
Thermionic device
|
|
US1963829A
|
|
Producing high vacua
|
|
US1908473A
|
|
Separation of tantalum from columbium
|
|
US1925978A
|
|
Alloy and article composed of same
|
|
DE618550C
|
|
Getter material for generating high vacuums
|
|
GB365801A
|
|
Production of high vacua
|
