Ζ-18 ... Ζ-18
ΝΝ-18 ... ΝΝ-18-1 ... ΝΝ-18-1
ΟΟ-18 ... ΟΟ-18
Κ-18 ... Κ-18-1 ... Κ-18-1
House 631/20 ... Ε-1 17, 18 Section Ε 17 Section Ε 18 Section Ε 19 Section Ε 20 ... 27 April 1931 ... Ε-1 ... 17, 18 ... Section Ε 18
Β'-1 18, 19 Section Β' 1 ... 24 April 1934 ... 18, 19 ... Β'-1 ... Section Β' 1
Ψ-1 18, 19 ... 18, 19 ... Ψ-1
ΛΛ-1 18, 19 ... 2 Feb 1937 ... 18, 19 ... ΛΛ-1