It is interesting that registers seem to be very prevalent in Europe compared to the United States. This is due to the fact that in Europe the telegraph systems were under strict control by government authorities. Post Offices, railways, and telecommunications were under jurisdiction of government agencies. These bureaucratic systems enforced regulations requiring physical proof of the messages. In the United States the telegraph companies were private entities with relatively minimal regulation by the government. The labor saving and simplicity of the sounder was adopted early, although registers continued to be used in some cases, such as the wire transfer of money. In Europe sounders were used later in the history of the telegraph. For example, it was not until 1892 that sounders were officially permitted in Belgium. At the London International Telegraphy Conference in 1903 the use of sounders on international lines was adopted.
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