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These two CD numbers have raised questions for me for a while. They don't seem to fit in a place where they were needed by a Canadian glass works, I felt maybe the 136.4 was a Burlington Glass unit but was never sure. 
That said , what follows is only putting forward info to be re-thought by others. I have no info on the lines on which these are found other than the J R Booth line, Canada Atlantic Ry. from Ottawa to the Quebec border .The 133.2 was the first insulator on this line in 1880-81.  
On one of my wife's five hours per night on the net searches  , she came across an ad in New Hampshire directory for 1881 listing J.R. Booth as many things including " Glass Importer "  He was needing glass for his windows , doors etc.

( do a google search on Booth he was an amazing man.) In this ad he was not importing glass from Canada or Europe to the U.S. rather he would have been getting glass from the U.S.A. to Canada for his doors . These adds were in at least three States from 1881 to 1884.
Was this where he got the 133.2 used on his first line ? Ibelieve so..These were the first insulators on that line .
 Later he went on to build the largest privately owned rail system in the world at that time.

I fully believe it was Booth that imported these two CD 's into Canada from the U.S. glass works . Both are very much like the U.S. moulds . 133.2 is almost the same as the CD 728 threadless and the 136.4 is a U.S. design.  It is very possible that he imported both of these styles for other small rail lines and telegraph companies.

j r booth

  Three pictures below of 133.2     Below them is a 728 threadless US made.

cd 133.2 insulator
cd 133.2 insultor
cd 133.2 insulator
cd 728 threadless

Top pic below is the Canadian style on each side,   with a US style segmented thread in the middle.

Second pic is again a US style segmented threads.

Pics below those are Canadian style Boston's. 

cd 136.4 insulator
cd 136.4 insulator
cd 136.4 insulator
cd 136.4 insulator
cd 136.4 insulator
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