{HEAD ~ A mailbox signal device} for use in {TAIL ~ combination} with rural type mailboxes which are configured with a door having a rearwardly extending flange; or, a door protected by a forwardly protruding hood 
{ HEAD ~ A mailbox signal device } for use in { TAIL ~ combination } with rural type mailboxes which are configured with a door having a rearwardly extending flange ; or , a door protected by a forwardly protruding hood
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