09 February (Netherlands ) within release 100 Years of patent goes into circulation Stamp Artificial kidney. Willem Kolff 1943 face value 44 Euro cent
Stamp Artificial kidney. Willem Kolff 1943 in catalogues | |
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Michel: | Mi:NL 2728 |
NVPH: | NVP:NL2699 |
Stamp is horizontal format.
Also in the issue 100 Years of patent:
Stamp Artificial kidney. Willem Kolff 1943 it reflects the thematic directions:
An invention is a unique or novel device, method, composition, idea, or process. An invention may be an improvement upon a machine, product, or process for increasing efficiency or lowering cost. It may also be an entirely new concept. If an idea is unique enough either as a stand-alone invention or as a significant improvement over the work of others, it can be patented. A patent, if granted, gives the inventor a proprietary interest in the patent over a specific period of time, which can be licensed for financial gain.