La bilancia nei BREVETTI

ANNI 1870-1879

J. Foller - Detachable Balancing Beams for Weighing-Scales
No. 147.383 / Patented Feb. 10.1874

ANNI 1880-1889

A. Williams - Weighing Scale
No. 243.186 / Patented June 21, 1881

ANNI 1890-1899

J. H. Swihart - Price and Weighing Scale
No. 575.077 / Patented Jan. 12, 1897

ANNI 1900-1909

R. N. Fairbanks & O. B. Johnson - Weighing Scale
No. 642.970 / Patented Feb. 6, 1900

ANNI 1910-1919

C. H. Hapgood - Weighing Scale
No. 1.285.141 / Patented Nov. 19, 1918

ANNI 1920-1929

R. Von Frommer - Weighing Scale
No. 1.565.126 / Patented Dec. 8,1925

ANNI 1930-1939

G. R. Wood - Predetermined Weight indicating device for Scales
No. 1.742.229 / Patented Jan. 19, 1930

ANNI 1940-1949

J. G. Juhasz - Dial holding means for Weighing Scales
No. 2.446.332 / Patented Aug. 3, 1948 

ANNI 1950-1959

N. E. Hart - Rearing Thrust Adjustament

No. 2.731.309 / Patented Jan. 17, 1956

ANNI 1960-1969

H. O. Friedrich - Weighing Scale
No. 3.193.031 / Patented July 6, 1965

ANNI 1970-1979

No. 3.809.171 / Patented May 7, 1974

ANNI 1980-1989

No. 281.057 / Patented Oct. 22, 1985

ANNI 1990-1999

No. 5.902.965 / Patented May 11, 1999

ANNI 2000-2009

No. 6441235 / Patented May 15, 2000