Torpedo In-Line Magnets for Vacuum Systems

I've read in separate accounts that the U.S., Britain, and Germany all started World War II with secret magnetic torpedo exploders that didn't work. Who can shed some light on what seems

DeWalt - DWHT43003 - 9 in. Magnetic Torpedo Level 76174430035

Greenlee L107 4 Vial Mini Magnetic Professional Grade Electrician's Torpedo Level 8-1/2-Inch Green

Pneumatic Line Magnet Missile Style Magnetic Separator

Swanson 9 in. Aluminum Lighted Magnetic Torpedo Level with 3 Bubble Vials, Etched Ruler and Straight Edge TLL049M - The Home Depot

WEN 1.25-Inch by 10-Foot Dust Hose Kit with Fittings and Reducers

TOUGHBUILT Aluminum 9-in 4 Vial Magnetic Torpedo Level in the Levels department at

The Empire em75.10 True Blue heavy duty torpedo levels features a tough all metal frame to stand up to tough jobsite conditions. High strength rare

True Blue 10 in. Rare Earth Magnetic Torpedo with Dual Vari-Pitch

Kobalt Aluminum 12-in 4 Vial Magnetic Torpedo Level in Blue | KB6012

ITM112 - Torpedo In-Line Magnets

Pneumatic In-Line Magnets

Greenlee L107 4 Vial Mini Magnetic Professional Grade Electrician's Torpedo Level 8-1/2-Inch Green

Empire 9 in. True Blue Professional Magnetic Torpedo Level EM81.9G - The Home Depot

Empire® 331-9 Magnetic Torpedo Level

American Fishing Wire Tooth Proof Stainless Steel Leader Wire 30ft

Crappie Sinker Rigs - In-Fisherman

LEAD CORE LINE: CUTTING THROUGH THE CRAP - Mark Romanack – Great

American Fishing Wire Surfstrand Camo Wire Camo; 1000 ft.

Torpedo 19-Strand Trolling Wire Line - FishUSA