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An item with a registry mark or number could have been produced before (less likely as the design would not be protected), or after the date of the registry mark.
The number listed for each year in the table is the first number issued that year. If your number is higher, but less than the number for the next year, then your item had it's design registered during that year.
Uranium and thorium also have diverse current or historical uses, and americium is used in the ionization chambers of most modern smoke detectors.
Of the actinides, primordial thorium and uranium occur naturally in substantial quantities.
The Public Record office and the British Government tend to enforce these marks and registration numbers.
Companies located outside the UK who have reproduced items, and tried to use a facsimile of the marks or numbering system have been sued, and have had sanctions imposed against them.
They all have very large atomic and ionic radii and exhibit an unusually large range of physical properties.
All but one of the actinides are f-block elements, with the exception being either actinium or lawrencium.
Starting in 1842, England has offered registration of it's decorative designs for pottery, china, wood, paper, pottery, china, porcelain, glass and more.
By using the information below you can find the date a design was registered. Remember this date is just when the design was registered.
This tends to protect the use of these marks, and in general restricts them to use on pieces made in the UK.
This protects both collectors and the companies who registered the marks.