a, How old am I? 100 Amp M.E.M. porcelain B.S.3036 fuse carrier.
b, When was it first used?
c, When was it last used, superseded by H.R.C. cartridge fuses. ?
https://www.ebay.co.uk/itm/MEM-KANTARK-100-AMP-415V-PORCELAIN-FUSE-CARRIER/323972442005?hash=item4b6e432795:g:tJwAAOSwqbZdPs8K
Z.