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