 1954 Acoustic suspension loudspeaker

1954 Model rocketry

1954 Door (automatic sliding)

1954 Mogen clamp

1954 Cardiopulmonary resuscitation

1954 Active noise control


1954 Synthetic diamond

1954 Radar gun

1955 Sling lift

A sling lift is an assistive device that allows patients in hospitals and nursing homes and those receiving home health care to be transferred between a bed and a chair or other similar resting places, using hydraulic power.Sling lifts are used for patients whose mobility is limited.The sling lift was patented on April 12, 1955 by Ronald R. Stratton in what he called a "floor crane with adjustable legs".