Abstract: A flotation fabric is composed of two opposed layers of water permeable flexable woven or knitted material. Sandwiched between the layers are small particles, pellets or beads of closed cell foam plastic material. The cloth layers are joined together by stitching, heat sealing or adhesive to trap and flexibly immobilized the pellets between the layers to form a breathable flexible flotation fabric. Personal flotation devices or garments such as T shirts are made from the fabric. They are light weight, flexible, breathable and comfortable enough to be worn by a child at play and will allow a child to return to the surface and cry out for help to prevent drowning if the child falls in a body of water.

Abstract: A lock box is provided with a locking cover held locked by a locking element. The lock mechanism is operated by the fingers of a hand actuating individual tumblers, one for each finger, simultaneously. The fingers push against the tumblers and the distance they push them is determined by the length of the fingers which are held by interdigital stops. The tumblers are spring biased against the finger motion. Each tumbler is provided with a stop and pass mechanism that is adjustable along the length of the tumbler to correspond to a particular finger length so that the pass elements of each tumbler will all be aligned to permit passage of the locking element when a particular hand actuates the mechanism, whereas hands of other elements will position at least one of the stop elements so that the locking element cannot pass and the container remains closed.