|
US1489099A
|
|
Manufacture and production of gas-tight seals or closures between metal and vitreous material
|
|
US1474293A
|
|
Thermionic valve
|
|
GB185952A
|
|
Improvements in the manufacture and production of gas-tight seals, or closures between metal and vitreous material
|
|
US1533900A
|
|
Mercury and other vapor electric lamp
|
|
GB175459A
|
|
Improvements in, or connected with, thermionic valves
|
|
GB172666A
|
|
Improvements in mercury, and other, vapour electric lamps
|
|
US1054647A
|
|
Silica-glass electric appliance.
|
|
US1055185A
|
|
Mercury and other vapor electric lamp.
|
|
GB191124482A
|
|
Improvements in connected with Articles made of Silica Glass and Requiring Leading-in Wires Combined therewith.
|
|
CA137004A
|
|
Manufacture and production of silica-glass
|
|
US1003271A
|
|
Manufacture and production of silica glass.
|
|
US939708A
|
|
Mercury and other vapor electric lamp.
|
|
GB190821834A
|
|
Improvements in Mercury, and other Vapour, Electric Lamps.
|
|
GB190805596A
|
|
Improvements in Mercury, or other Vapour Electric Lamps.
|
|
US923124A
|
|
Mercury or other vapor electric lamp.
|
