Lots of Econolite questions

Hey guys, I have lots of questions about Econolite signals. Here are some of them:
1— When were long groove sections changed to short groove?
2— Does anyone know anything about the Bullseye-era 12" square pedestrian signal? It was their only non-roundbody 12" signal. All I've seen of it is a picture on the first page of the 8" ped catalog (with no other mention), and this picture from Steven. They appear to have some extra space between the lenses and visors.
3— Besides square incandescent 9" & 12" W/DW, round incandescent 8" Walk/Wait, and neon 16" W/DW & Walk/Wait, did they offer any more pedestrian signals? (Like incandescent 16" signals?) Also, were 12" round Walk/Wait signals offered by Econolite, or were the lenses a seperate job?
4— Did Bullseye & Grooveback signals stop being made / Buttonback signals start being made in 1982?
5— Where did the T-Con style signals come in? The history section on the Econolite website says: "In 1989, Econolite acquired Trafcon of Jacksonville, Florida, to serve as sales, service, and manufacturing headquarters for the Southeast." Does that mean those signals were only made/distributed in the Southeast Region of the US (replacing buttonback sales for that region only) ? And Buttonback signals were still supplied everywhere else in the US? That would explain their rarity.
If that is true, when was the Kentron design discontinued? After that, I assume the buttonback design was returned (throughout the entire US).
6— When exactly was the 12" aluminum Buttonback signal design changed to have the McCain style back? And was the 12" poly Buttonback design back changed too, or are they still the same? Also, was the poly design first introduced at the same time as the aluminum?
And has the 16" ped housing design changed?
7— Does anyone have, or know of, an aluminum Econolite arrow mask/shield like the one below?
Thanks! Sorry if some were confusing, I know many of these may not be answered.
EDIT: Could whoever has the Econolite catalog in the signal archive scan the rest of it? I'm curious to see the 12" and 16" signals.
1— When were long groove sections changed to short groove?
2— Does anyone know anything about the Bullseye-era 12" square pedestrian signal? It was their only non-roundbody 12" signal. All I've seen of it is a picture on the first page of the 8" ped catalog (with no other mention), and this picture from Steven. They appear to have some extra space between the lenses and visors.
3— Besides square incandescent 9" & 12" W/DW, round incandescent 8" Walk/Wait, and neon 16" W/DW & Walk/Wait, did they offer any more pedestrian signals? (Like incandescent 16" signals?) Also, were 12" round Walk/Wait signals offered by Econolite, or were the lenses a seperate job?
4— Did Bullseye & Grooveback signals stop being made / Buttonback signals start being made in 1982?
5— Where did the T-Con style signals come in? The history section on the Econolite website says: "In 1989, Econolite acquired Trafcon of Jacksonville, Florida, to serve as sales, service, and manufacturing headquarters for the Southeast." Does that mean those signals were only made/distributed in the Southeast Region of the US (replacing buttonback sales for that region only) ? And Buttonback signals were still supplied everywhere else in the US? That would explain their rarity.
If that is true, when was the Kentron design discontinued? After that, I assume the buttonback design was returned (throughout the entire US).
6— When exactly was the 12" aluminum Buttonback signal design changed to have the McCain style back? And was the 12" poly Buttonback design back changed too, or are they still the same? Also, was the poly design first introduced at the same time as the aluminum?
And has the 16" ped housing design changed?
7— Does anyone have, or know of, an aluminum Econolite arrow mask/shield like the one below?
Thanks! Sorry if some were confusing, I know many of these may not be answered.
EDIT: Could whoever has the Econolite catalog in the signal archive scan the rest of it? I'm curious to see the 12" and 16" signals.