By services, 18 January, 2022 11 September 1990 Ministerial Letter 901298 F - Scientific Research and Experimental Development
By services, 18 January, 2022 11 June 1991 Ministerial Letter 910408 F - Acceptance of the "Completion Method" of Reporting Contract Revenue
By services, 18 January, 2022 26 August 1991 Ministerial Letter 911958 F - Family Allowance - Claim for Dependant