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| Number | Title | Issue Date |
| 5076542 | Ball-cock Ball-cock made of plastic parts with a spherical shut-off element in a housing with at first end a nesting place for a sealing ring and at the other end an end flange with also a nesting place for a sealing ring, said end flange having a radially projecti... | 12/31/1991 |
| 4697787 | Ball valve made entirely of plastics material A ball valve made entirely of plastics material comprising a tubular casing with connection pieces which are fastened to both its ends and which together form a through passage for a medium, a ball disposed in the through passage inside the casing and pro... | 10/06/1987 |
| 4499890 | Heater and a method of controlling the combustion in such a heater A heater having a combustion chamber in which a burner and a heat exchanger for fluid to be heated are arranged. The burner is oblong and includes a mixing chamber with a venturishaped cross-section. A converging inlet part of the mixing chamber is connec... | 02/19/1985 |
