Items
Items
Subject is exactly
Microphone and other acoustic devices
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[Z001A], Telegram from Thomas Alva Edison to William Henry Preece, June 4th, 1878
1878-06-04 -
[Z005AQ], Letter from Alexander Graham Bell to William Henry Preece, February 25th, 1878
1878-02-25 -
[Z005AX], Letter from Thomas Alva Edison to William Henry Preece, May 4th, 1878
1878-05-04 -
[Z005BB], Letter from William Thomson (Lord Kelvin) to William Henry Preece, June 12th, 1878
1878-06-12 -
[Z005BB1], Telegram from Thomas Alva Edison to William Thomson (Lord Kelvin), June 4th, 1878
1878-06-04 -
[Z005BD], Letter from William Thomson (Lord Kelvin) to William Henry Preece, July 27th, 1878
1878-07-27 -
[Z005BE], Letter from William Thomson (Lord Kelvin) to David Edward Hughes, July 16th, 1878
1878-07-16 -
[Z005BG], Letter from William Thomson (Lord Kelvin) to Nature (London), July 30th, 1878
1878-07-30 -
[Z100CN], Letter from Henry Fischer (British Telegraph Service) to Frank Ives Scudamore, May 30th, 1873
1873-05-30 -
[Z400AU1], Letter from Thomas Alva Edison to Theodore Puskas, July 3rd, 1878
1878-07-03