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OT #306BR1
OEM # 306BR1
Base, bakelite, contact selector stopping switch 3-1/8" L 
OT #306BR2
OEM # 306BR2
Base, bakelite for movable
paddle contact 
OT #306CL1
OEM # 306CL1
Base, bakelite 
1 x 9/16" x 4-1/16" for 153B1 copper contact
OT #306R2
OEM # 306R2
Base, Stationary  
​with 4 Contacts
OT #306CL1
OEM # 306CL1
Base, bakelite 
1 x 9/16" x 4-1/16" for 153B1 copper contact
OT #306AP1
OEM # 306AP1
Base, for 6410E Key Operated Switch
OTIS Elevator Replacement Parts/ Contact Bases