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