4. Expanded, threaded, driven, headed, tool-deformed, or locked-thr
  5. Headed fastener element with nut, washer, securing means or cap
  6. Securing means pivotable about axis transverse to fastener...

David Stadler

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Locking device and method for catch basin and manhole...

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Securing means pivotable about axis transverse to fastener...
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Manhole cover security lock with controlled pressure release

Road structure – process – or apparatus – Pavement – Vault cover-closure
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2724265

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