Pilot balloon slide rule Mk IV A, by B.R.L., MO 2787/56, Met << CultureGrid

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Title: Pilot balloon slide rule Mk IV A, by B.R.L., MO 2787/56, Met

Creators:	B.R.L.;
License:	http://creativecommons.org/licenses/by-nc-sa/2.5/ - Creative Commons Licence
Materials:	plastic wood velvet
Size:	rule: 63 cm
Temporal:	1956