...reasonable expenses incidental thereto, based upon liabilities of the Contractor to third parties arising out of the performance of this contract; provided,...claims are not known to the Contractor on the date of tha execution of the release; and provided further that the Contractor gives notice of such claims...

...the Contractor to third parties arising out of the performance of this contract; provided, that the claims are not known to the Contractor on the date of the execution of the release, and that the Contractor gives notice of the claims In writing to the Contracting Officer within в years...

...upon liabilities of the Contractor to third parties arising out of the performance of this sontract: Provided, That such claims are not known to the Contractor on the date of the execution of the released: And provided further, That the Contractor gives notice of such claims in writing to the...