Dating glass backstamps

Glass tubing, test tubes, lab bottles, funnels and other miscellaneous laboratory equipment and containers were made in quantity.

fit=640,595&ssl=1" class="size-large wp-image-1855 jetpack-lazy-image" src="https://i1com/ resize=640,595" alt="CD 233 style power line insulator.

Note that the registration number does not form part of the mark.

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The Coalport factory was established in Shropshire by John Rose in the 1790's. became a limited liability company under its new owner Peter Bruff.

The new title which was adopted included the old name.

As well as showing that the design had been registered, diamond mark offered the buyer the reassurance of knowing an item was of British design.

It also assured the person registering the design a degree of protection from copying.

At first glance they look the same but if you look closely you can see that some have a number at the right hand corner and some have a letter.

You can ignore the number at the bottom of the diamond - this tells us how many items were included in the registration, (sometimes known as bundles or packages).

In 1930 Stuart reintroduced coloured glass (mainly green, blue and amber).

GLASS FACTORY INFO ~ Dating ~ Antique Bottles ~ Fruit Jars ~ Glass Electrical Insulators ~ Tableware ~ Articles about different kinds of Glassware ~ Manufacturers' Marks used by Glass Companies in the United States The trademark “Pyrex” was first used c.

The protection was dependent on the type of material and the class in which the product was placed.

The mark was created to identify the type of material used (known as the ), how many items were included, (sometimes known as bundles or packages, and the date of registration.

A."" width="640" height="595" data-recalc-dims="1" data-lazy-srcset="https://i0com/ A search of the internet, such as Google Images pages with “Pyrex insulator” and “CD 128” should bring up examples of that particular shape.

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