|
US1845906A
|
|
Material handling means
|
|
US1746359A
|
|
Material-handling plant
|
|
US1796549A
|
|
Material-storage plant
|
|
US1812071A
|
|
Apparatus for controlling air in dry separating tables
|
|
US1695570A
|
|
Dust-collecting system for dry-cleaning tables
|
|
GB243629A
|
|
Screening system and screens
|
|
GB242189A
|
|
Improvements in dry separating machines
|
|
GB242188A
|
|
Improvements in dry separating tables
|
|
US1546371A
|
|
Coaling station
|
|
US1578965A
|
|
Automatic reversible hoist
|
|
US1444195A
|
|
Process of screening coal
|
|
US1423624A
|
|
Limit switch for electric-driven hoists
|
|
US1352632A
|
|
Automatic traction-hoist
|
|
US1363029A
|
|
Measuring and hoisting apparatus
|
|
US1170077A
|
|
Car-loading apparatus.
|
