United States Patent 2950890
US Patent References:
/0257050.html
- - 0257050

/0360529.html
- - 0360529

/0952225.html
- - 0952225

/1129960.html
- - 1129960


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Primary Class:
248/118
Other Classes:
74/515R
Foreign References:
DK62687A
DE546773C