Multi-seater bicycle vehicle powered by the muscles of the driver's and passengers' legs, assisted by the power of an electric motor fed by a battery charged continuously by photovoltaic panels located on the vehicle's roof
PL423289A1
Method for protecting of a wooden building structure against the effects of strong wind
PL422521A1
Set of technical devices intended for generation of electrical energy, utilizing energy of sea waves for this purpose
PL422522A1
Complex, automatic, variable planetary gear, in which transfer of torque from the constant or smoothly variable speed driving shaft to the power take-off shaft takes place by means of gear wheels
PL419360A1
Passenger trailer structurally integrated with the motor scooter
PL418916A1
Multi-person vehicle powered by the driver and passengers log muscle force and by electric motor
PL355276A1
A vehicle powered by hands and legs
PL338769A1
Sail rigging for a watercraft
PL305787A1
Sail boom
PL299745A1
Flexible blade mounted outside a hull of watergoing vessels
