Undertaking
Patent
1979-06-04
1981-02-24
Marlo, George J.
Undertaking
36132, 272 96, A63B 2304, A64B 2118
Patent
active
042523150
ABSTRACT:
A training aid for foot muscles comprising a toe portion having a core member made of heavy metal such as lead and a resilient surface member surrounding the core member, and a heel portion having a core member made of heavy metal such as lead and a resilient surface member surrounding the core member. The toe and heel portions are so shaped that they form substantially a sole configuration, when they are placed side by side on the sole of a shoe.
REFERENCES:
patent: 259230 (1882-06-01), Sprague
patent: 1637565 (1927-08-01), Gordon
patent: 2545910 (1951-03-01), Aprile
patent: 3333352 (1967-08-01), Livingston
patent: 3517928 (1970-06-01), Shanahan
patent: 3716239 (1973-02-01), Goudreau
Field Lawrence I.
Marlo George J.
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