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Otis Replacement Parts/ Otis Key Switches 
OT 6410E2
OEM# Otis 6410E2
Keyswitch, complete, single make or single break, with common, momentary, 2 position, removable at center, 
uses Yale key # 27248

OT 6410E3
OEM# Otis 6410E3
Keyswitch, complete, single make or single break, with common, non-momentary, 2 position, removable in center, uses Yale key # 27248

OT 6410E4
OEM# Otis 6410E4
Keyswitch, complete, single make or single break, with common, momentary, 2 position, removable in both, 
uses Yale key # 27248