Railroad switch sweeper

Rear ejector roller and guide for scraper

Recovery of sediments from the bottom of the sea

Recovery of sediments from the bottom of the sea by suspended su

Reentrant driving arrangement for scraper elevator

Releasable latching apparatus for a benthic grab

Remote control snow blower discharge chute deflector

Remote underwater excavator and sampler

Remotely steerable dredge vehicle

Removable tooth with adapter for digging excavators

Retractable excavator cutting tooth apparatus

Retractable snowplow wing and mounting therefor

Reversible digging teeth and holder therefor

Reversible snowplow attachment

Rider type trenching machine

Ring structure for preventing blade damage

Roadway snow excavator

Rock digging apparatus

Roof snow scoop device

Root grubbing plow