“37. Any claim under section 80 of the Act shall be made in writing to the Commissioners and shall, by reference to such documentary evidence as is in the possession of the claimant, state the amount of the claim and the method by which that amount was calculated.”
“‘claim’ means a claim made … under section 80 of the Act for [credit of an amount accounted for to the Commissioners or assessed by them as output tax which was not output tax due to them], and ‘claimed’ and ‘claimant’ shall be construed accordingly.”