US PATENT SUBCLASS 213 / 30
.~.~.~ Plate springs
Current as of:
June, 1999
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213 /
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RAILWAY DRAFT APPLIANCES
7
DF
CUSHIONED
{9}
22
DF
.~ Combined spring and friction {8}
29
DF
.~.~ Interengaging friction springs {1}
30
.~.~.~ Plate springs
DEFINITION
Classification: 213/30
(under subclass 29) Devices wherein the springs are plate springs.