Derrick crane with wide horizontal swinging range of boom

Device for controlling the boom elevation of a side crane

Device for removing coke oven chamber door

Device for the purpose of preventing a body depending from ropes

Devices for erecting a building from prefabricated sections

Devices for transferring heavy loads at sea

Double slewing crane construction

Drum carriage for logging operations

Drum roller dispenser for dry particles, particularly...

Dual-purpose skyline log-yarding carriage

Electrical safety control device for a variable radius crane

Electrical switchboard apparatus with integral traveling lifting

Excavating device

Excavator having adjustable wheels

Excavator with low center of gravity

Extensible and collapsible portable derrick

Extensible boom

Extensible reach load lifting mechanism

Flexing beam assembly

Floating crane comprising a main jib which can be deposited on d