Internal and external splines used in vehicles, namely, apparatus for locomotion by land, air or water; Internal and external splines used in motors and engines for land, air or water vehicles; couplings for vehicles, namely, internal and external splines; shaft couplings for vehicles, namely, internal and external splines; internal and external splines used as couplings and transmission components for land and sea vehicles; internal and external splines used with gears of all types and gearboxes of all types, namely, planetary gearboxes in connection with land vehicles; right angle drives for land vehicles; two-speed gearbox drives for land vehicles; gear head drives for land vehicles; and, gear reducers for land vehicles; internal and external splines used in two speed and multi-speed mechanical, electric and hydraulic drive power transmitting mechanisms in the nature of gear reduction units for land and sea vehicles; internal and external splines used in wheel, track and drum drives for land and sea vehicles; internal and external splines used in shaft output drives for land and sea vehicles; internal and external splines used in spindle output drives for land and sea vehicles; internal and external splines used in compact drives for land and sea vehicles; internal and external splines used in winch drives for land and sea vehicles; internal and external splines used in jacking drives for land and sea vehicles; internal and external splines used in hoist drives for land and sea vehicles; internal and external splines used in electric drives for land and sea vehicles; internal and external splines used in compact double and triple reduction drives for land and sea vehicles; internal and external splines used in final drives and planetary gear drives for land vehicles; internal and external splines used with gears, shafts, gear differentials of all types and components thereof for land vehicles and sea vehicles; internal and external splines used in vehicles for locomotion off-highway by land or sea; internal and external splines used in vehicle transmissions for land and sea vehicles; internal and external splines used in rear wheel drives and planetary drives for land and sea vehicles; internal and external splines used in hydraulic, electric and mechanical apparatus for gear changing for land and sea vehicles; and, internal and external splines used in land transit vehicles, namely, trucks, busses, and railroad locomotives