US2722696A - Lighted rescue life line - Google Patents
Lighted rescue life line Download PDFInfo
- Publication number
- US2722696A US2722696A US334383A US33438353A US2722696A US 2722696 A US2722696 A US 2722696A US 334383 A US334383 A US 334383A US 33438353 A US33438353 A US 33438353A US 2722696 A US2722696 A US 2722696A
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- Prior art keywords
- conduit
- receptacles
- receptacle
- flexible
- electrical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C9/00—Life-saving in water
- B63C9/08—Life-buoys, e.g. rings; Life-belts, jackets, suits, or the like
- B63C9/20—Life-buoys, e.g. rings; Life-belts, jackets, suits, or the like characterised by signalling means, e.g. lights
Definitions
- This invention relates to floating life lines and particularly to illuminated buoyant life lines which are adapted for surface rescue work.
- Life lines as presently constructed are relatively crude, being made of either hemp, sisal or cotton rope and provided with floats to keep them on the surface. Since they are without adequate lighting means their visibility is poor, and when made of these materials their life is extremely short.
- Fig. 1 is a vertical axial section taken at 1-1 of Fig. 2 through one .of the light receptacles with two miniature "light bulbs mounted on and electrically connected within the receptacle.
- FIG. 2 is a right-hand end view of Fig. 1.
- Fig. 3 shows a section of a conventional hollow flexible conduit upon which the receptacles may be spaced apart and secured with the electrical conductor on the interior.
- Fig. 4 is across section through a hollow flexible conduit in which the conductive wires are imbedded and adapted to be looped at intervals and sealed within the walls of'the'conduit, so that the looped portions can be drawn through apertures when formed in the walls inside of the receptacles.
- Fig. 5 is a full line view of a receptacle looking in the same direction as when viewing Fig. 1.
- a housingor receptacle 10 has bulbs 12, one at each end. Hubs .12 are internally threaded to fit the external threads on the seal type lock nuts 16.
- the receptacleI10 maypreferably be made of molded plastic or :syntheticflexible rubber andmust be leakproof when assembled.
- the conventional type hose or conduit 25 which may be passed through the receptacle 10 and sealed thereto at both ends by the seal nuts 16 is shown in plan in Fig. 3, while the special type hose 25 is shown in cross section in Fig. 4.
- electrically conductive line wires 26 may be strung through the center opening 27 of a con- 2,722,696 F'iPatented Nov. 8, 1955 ventional flexible buoyant conduit and turned backrnpon itself as at 28 approximately-every six feet, as shown, to
- the line wires 26 may be vmolded into the Wall of the conduit 25 as shown-inFig. 4.
- one'loop iszpulled out from the positive line wire, and another from the negative, and bulb connections soldered .to the loops.
- the second method has .only the slight disadvantage that the line'wires in Fig. 1 .are more effectively separated from the water which may leak past the seals, and water cannot reach the buoyant interior of the conduit.
- Opposite sides of the receptacle 10 are slabbed 'offas at 18 and the openings thus formed areinternally threaded :for 'thevexternallythreaded covers 20.
- Transparent covers or lens 20 may preferably'be made of clear type plastic .or glass. The jointsbetween the body of the receptacle 10 and the covers 20, as well as the joints between the internal and external threads of the hub 12 and seal 16,
- Small bayonetdock-type of lamp sockets 22 containing bulbs 23 are mounted on fixed, preferably molded-in brackets 2.4 within the receptacles. Small holes may then be punched through the-wall of the flexible conduit 25 or v2.5 and the loops of the line wires 26 or 26 brought out through these small holes and connected to the lamp sockets 22 with leads 26.
- the material for 'the .conduit' may be either buoyant material such as undrawn nylon, or inflatable flexible tubing such as rubber, :plastic orthe-like.
- the lights may preferably be spaced approximately six feet apart and while, in Fig. 4 of the drawi g, the lighting conductors are shown as woven inthe wall of the conduit with thezlooped portions extendingoutwardly therethrough, .a satisfactory arrangemen may comprise a flexible waterproof inflatableconduit in which the wires are strung in the interior bore or openings-of the conduit as in Fig. 3. In either situation the necessary length of conductor for making the connections is obtained by lapping the cable back upon itself to .form loops as .at 28, Fig. 3, for making the electrical connections thereto.
- the life line when-in use, is'payed out and towed in back of the rescue ship through the area being searched, the same'ship being arranged to provide electric current forthe lights and if necessary air pressure can be supplied to the interior of the-conduit, where that is needed to keep the line afloat.
- the line may preferably be approximately one hundred fifty feet long and made of material light enough in weight with its hollow interior to .make 'it self-buoyant and having a covering of white-or other light color toprovide visibility.
- the lights may be powered by the towing craft, the current being either six, twelve, twenty-four or one-hundred ten volts.
- the device should be properly stressed to allow towing through the water at thirty knots and be able to lift a six hundred pound weight.
- the looped porions also provide expansion means at intervals along the conduit for the electric supply wires, so that no undue longitudinal stress or stretch will be applied to the electrical conductors should the conduit itself be stressed longitudinally to cause slight longitudinal stretching thereof.
- An illuminated rescue life line comprising a hollow elongated flexible watertight buoyant conduit means, a plurality of hollow lamp receptacles disposed on said conduit means at predetermined spaced intervals throughout the length of the conduit means with the conduit means extending through the receptacles, watertight sealing means between the opposite ends of each receptacle and the conduit means for sealing the receptacles watertight at their ends to the conduit means, a window fixed watertight in the side of each receptacle intermediate its watertight sealed ends, an electric lamp fixed within each receptacle in back of said window, flexible electrical conductor means extending longitudinally within the flexible conduit means for substantially the length of the conduit means and formed with looped portions located within the receptacles connected to said electrical lamps for illumination thereof when the conductor means is energized.
- An illuminated rescue life line comprising a hollow elongated flexible watertight buoyant conduit means, a plurality of hollow lamp receptacles disposed in longitudinally spaced relation on said conduit means at predetermined intervals throughout the length of the conduit means with the conduit means extending through the receptacles, watertight sealing means between the opposite ends of each receptacle and the exterior of the conduit means for sealing the interiors of the receptacles watertight at their opposite ends to the conduit means, a window fixed watertight in the wall of each receptacle intermediate its watertight sealed ends, an electric lamp socket fixed to the interior wall of the receptacle back of said window and adapted to receive an electric lamp therein, a pair of flexible electrical conductors extending longitudinally within the flexible conduit means in spaced relation to each other for substantially the length of the conduit means, said electrical conductor means each being formed with looped portions each located within one of said receptacles and connected at its end to the contact terminals of the electric lamp socket
- a flexible tubular buoyant conduit forming the life line and adapted to be closed at its opposite ends to prevent the escape of air from within the conduit, a plurality of lamp inclosing receptacles mounted on said conduit in spaced relation to each other, each receptacle formed with openings at its opposite ends to receive the conduit through said openings, an electric lamp fixed in each of said receptacles, a removable access window fitted watertight in said receptacle in front of said lamp, electrical conductor means for energizing and illuminating said lamps extending longitudinally within said conduit throughout substantially the entire length thereof, said electrical conductor extending through the outer wall of the conduit intermediate the openings in the ends of each receptacle and connected within the receptacle to the electric lamp therein, and sealing means between the exterior wall of the conduit and the openings in the ends of the receptacle to seal the interior of the receptacles watertight on said conduit.
- the electrical conductor means is formed with a plurality of slack portions to provide slack in the length of the electrical conductor means and at least one of said slack portions is located within each of the lamp receptacles between the ends thereof and extends through the outer wall of the conduit at a point within the receptacle between the opposite ends thereof and the end of the loop portion is electrically connected to the electrical lamp to illuminate the same when the electrical conductor is energized.
- the electrical conductor means comprises two electrical conductor wires extending longitudinally within said flexible conduit in spaced relation to each other and formed with slack extension portions located within each of the receptacles in the form of loop portions extending through the outer wall of the conduit into the interior of the receptacles at spaced points and connected substantially at the ends of the looped extension portions to the contact terminals of the electrical lamps within the receptacles, one electrical conductor loop extension being connected to one contact of each electric lamp and the other electrical conductor loop extension being connected to the other electrical lamp conduit for connecting the lamps within the receptacles in parallel throughout the length of the life line.
- the electrical conductor means comprises two electrical conductor wires extending longitudinally within the said flexible conduit in spaced relation to each other and formed with extension portions located within each of the receptacles extending through the outer wall of the conduit into the interior of the receptacles at spaced points and connected substantially at the ends of the extension portions to the contact terminals of the electrical lamps within the receptacles, one electrical conductor extension being connected to one contact of each electric lamp and the other electrical conductor extension being connected to the other electrical lamp contact for connecting the lamps within the receptacles in parallel throughout the length of the life line.
Description
Nov. 8, 1955 F. M. JOHNSON 2,722,696
LIGHTED RESCUE LIFE LINE Filed Jan. 30, 1953 INVENTOR. Ffifl/vc/a M J HNJO BYMAJJ 9ND W W 19 TTOENEY5 LIGHTED RESCUE LIFE LINE Francis M. Johnson, Dayton, ()hio, assignor to the United States .of America as represented by the Secretary of .the United States Air Force Application January 30, 1953, Serial No. 334,383
.8 Claims. (Cl. 914) (Granted under Title 35, U. S. Code (1952), sec. 266) The .invention described herein may be manufactured and usedby or for the United States Government for governmental purposes without payment to me of any royalty thereon.
This invention relates to floating life lines and particularly to illuminated buoyant life lines which are adapted for surface rescue work.
Life lines as presently constructed are relatively crude, being made of either hemp, sisal or cotton rope and provided with floats to keep them on the surface. Since they are without adequate lighting means their visibility is poor, and when made of these materials their life is extremely short.
These shortcomings existing in conventional designs are overcome in the life line hereinafter shown and described, in which a series of miniature light bulbs are longitudinally spaced apart, a flexible tubular conduit with waterproof receptacles or housings surrounding the conduit and bulbs and with electrical conductors for the bulbs either extendingthrough the main opening in the flexible tubular conduit or Woven in the walls of the flexible tubular conduit.
The manner in which this structure is achieved is hereinafter described, reference being had to the drawing, wherein:
Fig. 1 is a vertical axial section taken at 1-1 of Fig. 2 through one .of the light receptacles with two miniature "light bulbs mounted on and electrically connected within the receptacle.
'Fig. 2 is a right-hand end view of Fig. 1.
Fig. 3 shows a section of a conventional hollow flexible conduit upon which the receptacles may be spaced apart and secured with the electrical conductor on the interior.
Fig. 4 is across section through a hollow flexible conduit in which the conductive wires are imbedded and adapted to be looped at intervals and sealed within the walls of'the'conduit, so that the looped portions can be drawn through apertures when formed in the walls inside of the receptacles.
Fig. 5 is a full line view of a receptacle looking in the same direction as when viewing Fig. 1.
Like reference characters refer to like parts throughout the several-views.
In the drawings a housingor receptacle 10 has bulbs 12, one at each end. Hubs .12 are internally threaded to fit the external threads on the seal type lock nuts 16. The receptacleI10 maypreferably be made of molded plastic or :syntheticflexible rubber andmust be leakproof when assembled.
The conventional type hose or conduit 25 which may be passed through the receptacle 10 and sealed thereto at both ends by the seal nuts 16 is shown in plan in Fig. 3, while the special type hose 25 is shown in cross section in Fig. 4. As a simple method of practicing my invention (see Fig. 3) electrically conductive line wires 26 may be strung through the center opening 27 of a con- 2,722,696 F'iPatented Nov. 8, 1955 ventional flexible buoyant conduit and turned backrnpon itself as at 28 approximately-every six feet, as shown, to
allow for making the electrical connections 26 to the sockets exteriorly of the conduit, or, as a more approved method, the line wires 26 may be vmolded into the Wall of the conduit 25 as shown-inFig. 4. In practicing'the approved method, one'loop iszpulled out from the positive line wire, and another from the negative, and bulb connections soldered .to the loops. The second method :has .only the slight disadvantage that the line'wires in Fig. 1 .are more effectively separated from the water which may leak past the seals, and water cannot reach the buoyant interior of the conduit.
Opposite sides of the receptacle 10 are slabbed 'offas at 18 and the openings thus formed areinternally threaded :for 'thevexternallythreaded covers 20. Transparent covers or lens 20 may preferably'be made of clear type plastic .or glass. The jointsbetween the body of the receptacle 10 and the covers 20, as well as the joints between the internal and external threads of the hub 12 and seal 16,
mustbe fully sealed waterproof.
Small bayonetdock-type of lamp sockets 22 containing bulbs 23 are mounted on fixed, preferably molded-in brackets 2.4 within the receptacles. Small holes may then be punched through the-wall of the flexible conduit 25 or v2.5 and the loops of the line wires 26 or 26 brought out through these small holes and connected to the lamp sockets 22 with leads 26.
with ffive-sixteenths inch hole for the conduit is thought to have the widest application.
The material for 'the .conduit'may be either buoyant material such as undrawn nylon, or inflatable flexible tubing such as rubber, :plastic orthe-like.
Whichever material-is used, the lights may preferably be spaced approximately six feet apart and while, in Fig. 4 of the drawi g, the lighting conductors are shown as woven inthe wall of the conduit with thezlooped portions extendingoutwardly therethrough, .a satisfactory arrangemen may comprise a flexible waterproof inflatableconduit in which the wires are strung in the interior bore or openings-of the conduit as in Fig. 3. In either situationthe necessary length of conductor for making the connections is obtained by lapping the cable back upon itself to .form loops as .at 28, Fig. 3, for making the electrical connections thereto.
The life line, when-in use, is'payed out and towed in back of the rescue ship through the area being searched, the same'ship being arranged to provide electric current forthe lights and if necessary air pressure can be supplied to the interior of the-conduit, where that is needed to keep the line afloat.
Whiletwo bulbs per .station is preferable and is recommended, a single bulb-for .eachzstation-may, under certain conditions, give satisfactory results. In either case the line may preferably be approximately one hundred fifty feet long and made of material light enough in weight with its hollow interior to .make 'it self-buoyant and having a covering of white-or other light color toprovide visibility.
The lights may be powered by the towing craft, the current being either six, twelve, twenty-four or one-hundred ten volts. The device should be properly stressed to allow towing through the water at thirty knots and be able to lift a six hundred pound weight.
The looped porions also provide expansion means at intervals along the conduit for the electric supply wires, so that no undue longitudinal stress or stretch will be applied to the electrical conductors should the conduit itself be stressed longitudinally to cause slight longitudinal stretching thereof.
Having described an embodiment of my invention, I claim:
1. An illuminated rescue life line comprising a hollow elongated flexible watertight buoyant conduit means, a plurality of hollow lamp receptacles disposed on said conduit means at predetermined spaced intervals throughout the length of the conduit means with the conduit means extending through the receptacles, watertight sealing means between the opposite ends of each receptacle and the conduit means for sealing the receptacles watertight at their ends to the conduit means, a window fixed watertight in the side of each receptacle intermediate its watertight sealed ends, an electric lamp fixed within each receptacle in back of said window, flexible electrical conductor means extending longitudinally within the flexible conduit means for substantially the length of the conduit means and formed with looped portions located within the receptacles connected to said electrical lamps for illumination thereof when the conductor means is energized.
2. An illuminated rescue life line comprising a hollow elongated flexible watertight buoyant conduit means, a plurality of hollow lamp receptacles disposed in longitudinally spaced relation on said conduit means at predetermined intervals throughout the length of the conduit means with the conduit means extending through the receptacles, watertight sealing means between the opposite ends of each receptacle and the exterior of the conduit means for sealing the interiors of the receptacles watertight at their opposite ends to the conduit means, a window fixed watertight in the wall of each receptacle intermediate its watertight sealed ends, an electric lamp socket fixed to the interior wall of the receptacle back of said window and adapted to receive an electric lamp therein, a pair of flexible electrical conductors extending longitudinally within the flexible conduit means in spaced relation to each other for substantially the length of the conduit means, said electrical conductor means each being formed with looped portions each located within one of said receptacles and connected at its end to the contact terminals of the electric lamp sockets for energizing the sockets to illuminate the electric lamps when placed in said sockets.
3. Apparatus as claimed in claim 1 in which the electrical conductor means is located in the wall of the conduit means between the inner and outer surfaces thereof and said looped portions extend outwardly through apertures formed in the outer wall of the conduit means within the receptacles, and connected at the ends of the looped portions to the electric lamps.
4. Apparatus as claimed in claim 2 in which the two electrical conductors are located in the wall of the conduit means between the inner and outer surfaces thereof in spaced relation to each other and the ends of the loop portions of the electrical conductors extend through openings provided therefor in the outer wall of the conduit means located within the receptacles and connected to the electrical contacts of said lamp sockets.
5. In an illuminated, flexible life line, a flexible tubular buoyant conduit forming the life line and adapted to be closed at its opposite ends to prevent the escape of air from within the conduit, a plurality of lamp inclosing receptacles mounted on said conduit in spaced relation to each other, each receptacle formed with openings at its opposite ends to receive the conduit through said openings, an electric lamp fixed in each of said receptacles, a removable access window fitted watertight in said receptacle in front of said lamp, electrical conductor means for energizing and illuminating said lamps extending longitudinally within said conduit throughout substantially the entire length thereof, said electrical conductor extending through the outer wall of the conduit intermediate the openings in the ends of each receptacle and connected within the receptacle to the electric lamp therein, and sealing means between the exterior wall of the conduit and the openings in the ends of the receptacle to seal the interior of the receptacles watertight on said conduit.
6. Apparatus as claimed in claim 5 in which the electrical conductor means is formed with a plurality of slack portions to provide slack in the length of the electrical conductor means and at least one of said slack portions is located within each of the lamp receptacles between the ends thereof and extends through the outer wall of the conduit at a point within the receptacle between the opposite ends thereof and the end of the loop portion is electrically connected to the electrical lamp to illuminate the same when the electrical conductor is energized.
7. Apparatus as claimed in claim 5 in which the electrical conductor means comprises two electrical conductor wires extending longitudinally within said flexible conduit in spaced relation to each other and formed with slack extension portions located within each of the receptacles in the form of loop portions extending through the outer wall of the conduit into the interior of the receptacles at spaced points and connected substantially at the ends of the looped extension portions to the contact terminals of the electrical lamps within the receptacles, one electrical conductor loop extension being connected to one contact of each electric lamp and the other electrical conductor loop extension being connected to the other electrical lamp conduit for connecting the lamps within the receptacles in parallel throughout the length of the life line.
8. Apparatus as claimed in claim 5 in which the electrical conductor means comprises two electrical conductor wires extending longitudinally within the said flexible conduit in spaced relation to each other and formed with extension portions located within each of the receptacles extending through the outer wall of the conduit into the interior of the receptacles at spaced points and connected substantially at the ends of the extension portions to the contact terminals of the electrical lamps within the receptacles, one electrical conductor extension being connected to one contact of each electric lamp and the other electrical conductor extension being connected to the other electrical lamp contact for connecting the lamps within the receptacles in parallel throughout the length of the life line.
References Cited in the file of this patent UNITED STATES PATENTS 1,174,594 McGifi Mar. 7, 1916 2,368,558 Maloney Jan. 30, 1945 2,642,591 Craver June 23, 1953 FOREIGN PATENTS 312,464 Great Britain May 30, 1929 470,816 Great Britain Aug. 18, 1937
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US334383A US2722696A (en) | 1953-01-30 | 1953-01-30 | Lighted rescue life line |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US334383A US2722696A (en) | 1953-01-30 | 1953-01-30 | Lighted rescue life line |
Publications (1)
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US2722696A true US2722696A (en) | 1955-11-08 |
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US334383A Expired - Lifetime US2722696A (en) | 1953-01-30 | 1953-01-30 | Lighted rescue life line |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1118041B (en) * | 1958-04-25 | 1961-11-23 | Schermuly Pistol Rocket Appara | Device for rescuing people from distress at sea by means of a floating line |
US3905060A (en) * | 1972-08-14 | 1975-09-16 | Intercontinental Marine Ltd | Anchoring device for buoyant life saving equipment |
US4656679A (en) * | 1984-09-28 | 1987-04-14 | James Industries Limited | Lifting slings |
US4776532A (en) * | 1986-02-05 | 1988-10-11 | Kjell Haltbrekken | Rescue equipment to be used in the passenger cabin of a vessel |
US5468167A (en) * | 1994-07-29 | 1995-11-21 | Givens; James A. | Life raft utility tether |
US6257942B1 (en) | 2000-09-18 | 2001-07-10 | J. Steven Groover | Phosphorescent rescue line throw-bag |
US20020126473A1 (en) * | 2001-03-07 | 2002-09-12 | The Government Of The United States Of America As Represented By The Secretary Of The Department Of | Lighted line |
US7887382B1 (en) * | 2005-12-27 | 2011-02-15 | Kasper Bryan J | Multipurpose water rescue apparatus |
JP5922827B1 (en) * | 2015-05-29 | 2016-05-24 | 株式会社エクスプロア | Rescue rope with automatic light-emitting device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1174594A (en) * | 1915-07-27 | 1916-03-07 | James Richard | Luminous life-belt. |
GB312464A (en) * | 1928-04-30 | 1929-05-30 | Johan Cornelis Hoos | Improvements in or relating to cords, ropes, cables and the like, and buoyant articles made therewith |
GB470816A (en) * | 1936-02-18 | 1937-08-18 | Karl Jonasen Refsnaes | Improvements in and relating to marine life saving appliances |
US2368558A (en) * | 1944-03-27 | 1945-01-30 | William F Driscoll | Lifesaving apparatus |
US2642591A (en) * | 1951-05-24 | 1953-06-23 | Clyde R Craver | Life preserver and illuminating means therefor |
-
1953
- 1953-01-30 US US334383A patent/US2722696A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1174594A (en) * | 1915-07-27 | 1916-03-07 | James Richard | Luminous life-belt. |
GB312464A (en) * | 1928-04-30 | 1929-05-30 | Johan Cornelis Hoos | Improvements in or relating to cords, ropes, cables and the like, and buoyant articles made therewith |
GB470816A (en) * | 1936-02-18 | 1937-08-18 | Karl Jonasen Refsnaes | Improvements in and relating to marine life saving appliances |
US2368558A (en) * | 1944-03-27 | 1945-01-30 | William F Driscoll | Lifesaving apparatus |
US2642591A (en) * | 1951-05-24 | 1953-06-23 | Clyde R Craver | Life preserver and illuminating means therefor |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1118041B (en) * | 1958-04-25 | 1961-11-23 | Schermuly Pistol Rocket Appara | Device for rescuing people from distress at sea by means of a floating line |
US3905060A (en) * | 1972-08-14 | 1975-09-16 | Intercontinental Marine Ltd | Anchoring device for buoyant life saving equipment |
US4656679A (en) * | 1984-09-28 | 1987-04-14 | James Industries Limited | Lifting slings |
US4776532A (en) * | 1986-02-05 | 1988-10-11 | Kjell Haltbrekken | Rescue equipment to be used in the passenger cabin of a vessel |
US5468167A (en) * | 1994-07-29 | 1995-11-21 | Givens; James A. | Life raft utility tether |
US6257942B1 (en) | 2000-09-18 | 2001-07-10 | J. Steven Groover | Phosphorescent rescue line throw-bag |
US20020126473A1 (en) * | 2001-03-07 | 2002-09-12 | The Government Of The United States Of America As Represented By The Secretary Of The Department Of | Lighted line |
US6742909B2 (en) | 2001-03-07 | 2004-06-01 | The United States Of America As Represented By The Secretary Of The Department Of Health And Human Services | Lighted line |
US7887382B1 (en) * | 2005-12-27 | 2011-02-15 | Kasper Bryan J | Multipurpose water rescue apparatus |
JP5922827B1 (en) * | 2015-05-29 | 2016-05-24 | 株式会社エクスプロア | Rescue rope with automatic light-emitting device |
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