Adjustable depth control mechanism for earth-penetrating disk

Apparatus for determining the true cross slope of a blade

Centerline sight

Centerline sight with reverse pendulum

Cultivator disc adjuster

Cultivator with improved disc positioning means

Depth sensing skid assembly

Draft power sensor and method for improving performance in earth

Draft sensor including strain sensor coupled to load strap

Furrow follower vision correction system

Grade determining method and apparatus

Guidance system for farm implements

Indicating apparatus for a coupling

Leveling position indicator

Row crop cultivator including disk and setting indicator therefo

Row crop cultivator with setting indicator

Seed metering shaft rotation indicator

Tractor hitch with yoke having pivotally supported upper end

Tractor with a traction load sensing device

Wing fold implement with hydraulic mode indicator