Multiple Crank Patents

Three Cranks

Year

Four Cranks

Year

Six Cranks

Year

Centra Handels

GB334475

1930

N.L.Causan

FR615318

1925

Centra Handels

GB357690

1931

Centra Handels

GB337333

1930

N.L.Causan

US1701360

1928

C.E.Mahan

US2350626

1944

P.Schmaljohann

US1919572

1931

H.T.Herr

US1748478

1928



Centra Handels

GB365802

1932

Westinghouse

FR632746

1928



P.Schmaljohann

US2014672

1933

J.Pavlenka

US2085270

1933



Centra Handels

GB401934

1933

J.Pavlenka

US2117118

1936



Centra Handels

GB409541

1934

M.A.Paul

US5058537

1991



Centra Handels

GB439820

1935

M.A.Paul

US6282897

2001



H.Penwarden

GB602662

1948





B.W.Barlow

GB658894

1951





B.W.Barlow

US2601584

1952





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