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4153898 Audible alarm with laminated magnetic core  
An electrically actuated audible alarm having a magnetic structure comprising an assembly of laminations is provided to reduce eddy current losses. With the reduction of eddy current losses, faster...
3200388 Water leakage alarm system  
3121194 Polarized electromagnetic device  
3042843 Polarized a. c. ringers  
2928028 Polarized magnet arrangement  
Matches 1 - 5 out of 5