{HEAD ~ This invention} relates to educational devices, and more particularly, to {TAIL ~ a device} and method to aid in studying and understanding electromagnetic fields in nature and man made structures 
relates to
{ HEAD ~ This invention } relates to educational devices , and more particularly , to { TAIL ~ a device } and method to aid in studying and understanding electromagnetic fields in nature and man made structures
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH