Fidelman, Wolffe & Waldron
Concrete breaker
 A concrete breaker, in which in breaking a concrete structure, the inclination of the main chisel is maintained within a desired angle by a limit switch to prevent the chisel receiving bed and the ram from being damaged at least two mini-chisels disposed opposite the main chisel are slidably arranged and driving means for these chisels are encased in a machine frame provided with machine beds so that the machine body may be formed smaller and lighter in weight. 
Takenaka Komuten Company, Ltd.
E B Y E E
E04G B28D Y10T E04G E04G
inventional inventional additional additional inventional
Mitsuo Masao Masahiro Hiromichi Iwao Minoru Yoshihiro
Miura Miyaguchi Takigawa Yamada Uchizaki Ochiai Ishikawa