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