|
US2573064A
|
|
Lifting clamp
|
|
GB686542A
|
|
Improvements in the production of zinc
|
|
GB686585A
|
|
Improvements in the production of zinc
|
|
GB686589A
|
|
Improvements in apparatus for the production and condensation of metal vapours
|
|
GB553388A
|
|
Manufacture of sulphuric acid by the contact system
|
|
GB549340A
|
|
Improvements in the manufacture of sulphuric acid
|
|
GB478642A
|
|
Improvements in or relating to the roasting of ores especially zinc sulphide ores containing lead and/or cadmium
|
|
GB334862A
|
|
Improvements relating to vanadium catalysts for use in the oxidation of oxidisable gases
|
|
US1797928A
|
|
Manufacture of sulphuric acid
|
|
US1862828A
|
|
Roasting of zinc sulphide ores
|
|
GB320930A
|
|
Improvements in oxidising catalysts
|
|
GB306569A
|
|
Improvements in or relating to the roasting of zinc sulphide ores
|
|
GB303459A
|
|
Improvements in or relating to the manufacture of sulphuric acid
|
|
US1740837A
|
|
Preparation of sulphate of ammonia
|
|
GB299946A
|
|
Improvements relating to the sealing of gas chambers entered by electric conductors carrying high tension current
|
|
GB299934A
|
|
Improvements relating to the manufacture of sulphate of ammonia from gas works liquor or the like
|
|
GB297509A
|
|
Improvements in heat exchangers
|
|
GB289950A
|
|
Improvements in or relating to the preparation of sulphate of ammonia
|
