This invention relates to a mailbox signal device, operated by {HEAD ~ gravity}, which will indicate when {TAIL ~ mail} has been delivered to a rural type mailbox 
indicate when
This invention relates to a mailbox signal device , operated by { HEAD ~ gravity } , which will indicate when { TAIL ~ mail } has been delivered to a rural type mailbox
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH