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It is likely there was a gradual changeover on bottle and jar molds starting around 1938, but that transition probably occurred over several years time.Realizing that a large number of molds were in use, I would suspect it took a while for all of them to be re-tooled.https:// Insulators Antique & Collectable: Looking for Insulators of glass or pottery have been made for use on telegraph or telephone poles since 1844.S.- 94, (95, 96, 97, 98 depending on the year they were produced).Industrial Co., Number 8, private issue pieces were made in Korea as an advertising give-away for the Village Telephone Service in Arizona in the 1970's.N o 1"https:// In the fall of 2013 Dwayne Anthony conducted a survey on ICON about what was the most popular, desirable and favorite glass insulators.In the case of a tie for the tenth position, a special tie-breaker vote was conducted to determine the final tenth position The shaded rows represent the next ten runner-ups.https:// These were the workhorse insulators used on the open wire communications lines in the 1900's!They were produced for a number of years starting in the late 80's and sold as collector items.
One color per year, over a five year period, starting in 1994.
Whitall tatum insulators price guide keyword after analyzing the system lists the list of keywords related and the list of websites with related content, in addition you can see which keywords most interested customers on the this website Insulators of glass or pottery have been made for use on telegraph or telephone poles since 1844.
Thousands of different styles of insulators have been made.
and Wentzel-Cobbs should not be confused with real insulators due to their small size.
The four styles are similar to a CD 155, CD 203, CD 285 and a CD 297.
These were also frequently the insulators that first got collectors interested in the hobby.