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Gottfried Helbling
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21,932. Helbling, G. Oct. 16. Water-waste preventers, t a n k s and cisterns. A rim c' is formed by extensions of the walls on three sides of the flat bottom to protect pipe unions or other parts.
GB190821932D1908-10-161908-10-16Improvements in Flushing Tanks.
ExpiredGB190821932A
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