Michael, I have found number on one that I thought was a Girling commercial part number (Girling 314607)
I have since seen a different kind of expander with the same number. I now believe it to be Mr Girlings patent number.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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