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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7181796 | Mattress structure with an improved lumbar zone A mattress spring structure (10) is provided with a strengthened central area (C) thereon to provide greater support for a user's body lumbar region when received thereon. The support is provided with a strengthening structure (30) having a continuous ... | 02/27/2007 |
| 6983503 | Apparatus for packing free terminal convolutions of spring assembly used in mattress There is provided an innerspring assembly used in a mattress for absorbing external loads. An outermost coil spring 115 of a spring array 110 is secured in a space between upper and lower border wires 120 and 120′ by pins 140, an... | 01/10/2006 |
| 6832401 | Spring support system An improved spring support system is disclosed for use in seating or bedding. The invention includes an outer frame having opposed top edges. A plurality of vertically resilient members having top ends and lower ends are fixedly disposed within the outer frame in a ... | 12/21/2004 |
| 6487738 | Constant restoring force support surface An all mechanical support surface that tracks the flotation properties of a true fluid and utilizes a series of constant restoring force springs connecting reciprocating pistons which have supporting surfaces with multiple degrees of freedom to define a u... | 12/03/2002 |
| 4476595 | Mattress for use on a bed and settee A mattress for use on a bed and settee comprises a spring unit, at least one cushion, a protection layer arranged between the spring unit and the cushion, and an outer covering for covering these component members. The protection layer includes a frame lo... | 10/16/1984 |
