Wednesday, 13 July 2016

1.tnpsc material

எடிசன் காப்புரிமம் பெற்ற கண்டுபிடிப்புக்களில் ஒரு பகுதி
041 Electro-Harmonic Multiplex Telegraphs 1876
042 Stencil-Pens 1877
043 Telephonic Telegraphs 1877
044 Telephonic or Electro-Harmonic Telegraphs 1877
045 Phonographs or Speaking Machines 1878
046 Acoustic Telegraphs 1878
047 Automatic Telegraph Perforator and Transmitter 1879
048 Speaking Telegraphs 1878
049 Telephone Call-Signal 1878
050 Circuits for Acoustic or Telephonic Telegraphs 1878
051 Perforating Pens 1878
052 Pneumatic Stencil-Pens 1878
053 Quadruplex-Telegraph Repeaters 1878
054 Vocal Engines 1878
055 Electric Lights 1879
056 Thermal Regulators for Electric Lights 1879
057 Sextuplex Telegraphs 1879
058 Magneto-Electric Machines 1879
059 Apparatus for Electric Lights 1879
060 Electric Lighting Apparatus 1879



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