RE:ACTIONS or thinking inside the box

Hi
This 'piece' grew out of my interest in the internal workings of concertinas and the thoughts that knowing a bit more about who used what action may help to identify a concertina with no label. The pdf below is available for downloading it contains an appendix (i) which has photos of all the actions that I have located. There is also a sort of table detailing both the earliest and latest serial numbers of which I am currently aware. My hope is that anyone who can add to this information will contact me with information/photos which I will then incorporate into revisions.

Many thanks to the people who helped with comments, suggestions and information.

Special thanks to Neil Wayne who gave me access to his current collection of concertinas and photos.