Zwarte signaallamp van metaal in houten kist, vermoedelijk tbv Luchtmacht pamphlet RT procedure : RT for users - Engeland Voorschrift, 26/GS Publications/1388 All Informed or A Staff Officer's Guide to Signals Signal training. Vol. III : Switchboards U.C. 10-line and 6-line - Engeland Voorschrift, 26/Publications/5090, 26/GS Publications/232 Signal training. Pamphlet No. 7: Training : Training on long sea voyages - Engeland Voorschrift, 26/GS Publications/941 Field service pocket book. Part I : Signal codes - Engeland Voorschrift, 26/GS Publications/1194
