55997 was new to 5B in July 1958.

It was transferred to RTC use in Oct. '73 becoming 975385.

	,p>Two views at Derby RTC in 1979. It's pre-'Hydra' days, the lettering describes it only as Laboratory 9, and belonging to the Acoustics group.  Malcolm Clements
	At Vic Berry's, Leicester, where it was cut up in June 1986. Ian Francis