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  2. Shoe size - Wikipedia

    en.wikipedia.org/wiki/Shoe_size

    child shoe size (barleycorns) = 3 × last length (in) − 11 3 ⁄ 4. equivalent to: child shoe size (barleycorns) ≈ 3 × foot length (in) − 9 3 ⁄ 4. Alternatively, a Mondopoint-based scale running from K4 to K13 and then 1 to 7 is in use. [12] K4 to K9 are toddler sizes, K10 to K13 are pre-school and 1 to 7 are grade school sizes.

  3. Brannock Device - Wikipedia

    en.wikipedia.org/wiki/Brannock_Device

    Brannock Device [1] Brannock Device at shoe museum in Zlín, Czechia The Brannock Device is a measuring instrument invented by Charles F. Brannock for measuring a person's shoe size . Brannock spent two years developing a simple means of measuring the length, width, and arch length of the human foot .

  4. Shoe-fitting fluoroscope - Wikipedia

    en.wikipedia.org/wiki/Shoe-fitting_fluoroscope

    A shoe-fitting fluoroscope was a metal construction covered in finished wood, approximately 4 feet (1.2 m) high in the shape of short column, with a ledge with an opening through which the standing customer (adult or child) would put their feet and look through a viewing porthole at the top of the fluoroscope down at the X-ray view of the feet ...

  5. Voltage converter - Wikipedia

    en.wikipedia.org/wiki/Voltage_converter

    Transformers do not change the frequency of electricity; in many regions with 100–120 V, electricity is supplied at 60 Hz, and 210–240 V regions tend to use 50 Hz. This may affect operation of devices which depend on mains frequency (some audio turntables and mains-only electric clocks, etc., although modern equipment is less likely to ...

  6. File:Shoe sizes for children by foot length (multilingual).svg

    en.wikipedia.org/wiki/File:Shoe_sizes_for...

    English: Shoe sizes for children in Mondopoint, EU, UK and US systems, measured by foot length (multi-lingual) Русский: Размеры обуви для детей в системах Мондопойнт, EU, UK, and US, измеренные по длине стопы (несколько языков)

  7. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    An acceptable alternative version of the 5-20R receptacle has a rectangular slot that will only accept 5-20P plugs. The 5-30 and 5-50 are physically larger, with 1 in (25.4 mm) between power pins; 5-30 also has an L-shaped neutral blade. [17] These larger sizes are uncommon, as twist-locking plugs are generally used for high-current applications.