A glass to {HEAD ~ metal seal} is formed between the insulative preform 12 and {TAIL ~ the metal package} 14 at the aperture 16 to provide a hermetically sealed package 
A glass to { HEAD ~ metal seal } is formed between the insulative preform 12 and { TAIL ~ the metal package } 14 at the aperture 16 to provide a hermetically sealed package
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH