Category Nuances matching contrivance:

• modern,
• mechanical,
• literary,
• floating,
• special,
• optical,
• contemporary,

Members for simple category contrivance:

• mousetrap,
• valve,
• piston,
• mountain_train,
• lense,
• clock,
• guard,
• shoes,
• pollen_cache,
• zipper,
• lever,
• system,
• mirror,
• spring,
• sprocket,
• elevator,
• screw,
• design,
• ratchet,
• continuous_chain,
• record,
• radar,
• tape,
• telegraphic_device,
• little_windmill,
• meter,
• endless_chains,
• solenoid,
• gramophone_record,
• dvd,
• button,
• wheel,
• dynamometer,
• cam,
• drum_machine,
• foot,
• barbed_wire,
• computer,
• motor,
• microscope,
• deflector,
• headphone,
• plunger,
• compass,
• perforated_piano,