… and stands therefor; loudspeakers, whether or not mounted in their enclosures; headphones and earphones, …
Explanatory notes
… purpose for which such apparatus may be designed (e.g., telephone microphones, headphones and earphones, and radio … wire microphones , containing a heated resistance wire, the temperature of which, and therefore the resistance, is … of microphones (e.g., in public address equipment; telephony; sound recording; aircraft or submarine detectors; …