3 packets of Velox developing powder, silver foil with paper sleeves. Three Packets of Velox Developing Powder 1934
Packet of Illingworth's slow gas developer, wrapped in silver foil pactek and printed paper wrapper. Illingworth's Slow Gas Developer 1924
Six Socially Acceptable monitoring instruments (S.A.M.I.) units, 1961-1970 Six Socially Acceptable monitoring instruments (S.A.M.I.) units 1961-1970
