After many weeks of work, I recently completed my article and model list on Signal electric fans. The article gives some background on Signal and how they came about while the model list goes into all the models in the catalog set, where we could we linked to the Galleries here.
You can find the article at: http://www.dtvintagefans.org/signalinfo.htm
You can find the model list at: http://www.dtvintagefans.org/signalmodels.htm
Hopefully this will prove to be useful and interesting info for anyone interested in the fans Signal made.