Germany, Luftwaffe. A Lot of Trade Insignia

(Tätigkeitsabzeichen). A lot of four trade insignia, including an Air Raid/Aircraft Warning Service Trade Badge, a Signals Personnel Trade Badge, an Air Signals B Class Radio Operator Trade Badge, and an Air Signals B Class Telephone Operator Trade Badge, each constructed of silver-grey machine embroidery on blue-grey wool bases, measuring 51 mm in diameter, and in extremely fine conditions.