It's me again who wrote just above this. I found this and think you might all be interested. It could put a concrete finish on exatly what period of time certain things were happening with this company and certain instrument for some of you.
It's the official patent details. If you read through it all, you'll realise that there are supposed to be drawings for the banjo mandoline.
How cool am I??

Applicant ALBERT GEORGE HOUGHTONJOHN HARRISON HOUGHTON