It was (apparently) on this date in 1989 that Dr Thomas Hayes of the Royal Armaments Research and Development Establishment (RARDE) discovered amongst Lockerbie debris a fragment of circuit board embedded in a shirt collar. This became PT35(b) -- the notorious dodgy timer fragment. The story of the discovery and how it was recorded is narrated an article headed Page 51 and its Environs on Caustic Logic’s blog The Lockerbie Divide. The dialogue between Caustic Logic and Rolfe in the comments following the blogpost is also a mine of information. Another useful source of enlightenment is Dr Ludwig de Braeckeleer’s PT35B website.