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2. Martensitic stainless steel - Wikipedia

   en.wikipedia.org/wiki/Martensitic_stainless_steel

   Martensitic stainless steel is a type of stainless steel alloy that has a martensite crystal structure. It can be hardened and tempered through aging and heat treatment. It can be hardened and tempered through aging and heat treatment.

3. Ball valve - Wikipedia

   en.wikipedia.org/wiki/Ball_valve

   A ball valve is a flow control device which uses a hollow, perforated, and pivoting ball to control fluid flowing through it. It is open when the hole through the middle of the ball is in line with the flow inlet, and closed when it is pivoted 90 degrees by the valve handle, blocking the flow. [1]

4. SAE 316L stainless steel - Wikipedia

   en.wikipedia.org/wiki/SAE_316L_stainless_steel

   SAE 316L grade stainless steel, sometimes referred to as A4 stainless steel or marine grade stainless steel, is the second most common austenitic stainless steel after 304/A2 stainless steel. Its primary alloying constituents after iron , are chromium (between 16–18%), nickel (10–12%) and molybdenum (2–3%), up to 2% manganese [ 1 ] , with ...

5. Scraper (kitchen) - Wikipedia

   en.wikipedia.org/wiki/Scraper_(kitchen)

   A dough scraper is a tool used by bakers to manipulate dough and to clean surfaces on which dough has been worked. It is generally a small sheet of stainless steel (approximately 8 centimetres (3.1 in) by 13 centimetres (5.1 in)) with a handle of wood, plastic, or simply a roll in the steel blade along one of the long sides. [citation needed]

6. Type 91 torpedo - Wikipedia

   en.wikipedia.org/wiki/Type_91_torpedo

   Chronological Table 1931 – Type 91 aerial torpedo is put into service, production begins. 1936 – Revision 1. Self-detachable wooden plates are introduced. 1937 – Launch-tests at 500 and 1,000 m (550 and 1,100 yd) with wooden damper. 1939 – Revision 2 starts production. Not running true after water entry is identified as a major problem.

7. Toilet - Wikipedia

   en.wikipedia.org/wiki/Toilet

   A toilet [n 1] is a piece of sanitary hardware that collects human urine and feces, and sometimes toilet paper, usually for disposal. Flush toilets use water, while dry or non-flush toilets do not.