Technology

THORSTENSEN, SV.

Oslo, 1946.

DOWSETT, H.M.

London, The Gresham Publ. Comp., 1923-24.

SMILES, SAMUEL.

London, John Murray, 1857.

BERGSØE, PAUL.

Copenhagen, 1938.

WEYGAND, HERRMANN.

Laipzig, Buchhandlung für Militairwissenschaften, 1872.

OXHOLM, PETER LOTHARIUS.

Kiøbenhavn, Nicolaus Møller, 1777.

MÜLLER, HEINRICH.

Berlin, Polytechnische Buchhandlung 1875.

(VARIOUS AUTHORS).

New York, American Telephone and Telegraph Company, 1979.

TELEPHONY -

Chicago, 1906-14.

SIEMENS, C. W.

Newcastle-Upon-Tyne, M. & M. W. Lambert, 1877.

MORRISON, L. W.

New York, American Telephone and Telegraph Company, 1947.

PETERSON, E.

New York, American Telephone and Telegraph Company, 1946.

MEINERT, F. (FRIEDRICH).

Berlin, Maurerschen Buchhandlung, 1819.

BECKER, MAX.

Stuttgart, Carl Mäcken, 1853.

HAARMANN, F.L.

Holzminden, Schulbuchhandlung in Braunschweig, 1862.

(SAHLBOM, W.).

Stockholm, N. Marcus, 1859.

BREYMANN, G.A.

Stuttgart, Gustav Weise, 1868-81.

BREYMANN, G.A.

Stuttgart, Hoffmann'sche Verlags-Buchhandlung, 1860.