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Clockwork mechanism for Shaw type seismograph, British, 1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
1914
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
circa 1925
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935
1930-1935