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2. Petzl - Wikipedia

   en.wikipedia.org/wiki/Petzl

   In 1975, the Petzl corporation was born as Fernand Petzl established the first company headquarters in Crolles, France. “This was the beginning of Petzl manufacturing.”. [ 2 ] The initial workshop was approximately 7,200 square feet (670 m 2 ), and located at the base of Dent de Crolles “Tooth of Crolles” close to Grenoble.

3. Silver–calcium battery - Wikipedia

   en.wikipedia.org/wiki/Silver–calcium_battery

   Silver–calcium alloy batteries are a type of lead–acid battery with grids made from lead–calcium–silver alloy, instead of the traditional lead–antimony alloy or newer lead–calcium alloy. They stand out for its resistance to corrosion and the destructive effects of high temperatures.

4. Fernand Petzl - Wikipedia

   en.wikipedia.org/wiki/Fernand_Petzl

   Fernand Petzl (April 7, 1913 – May 31, 2003) was a caver and manufacturer of outdoor equipment under the brand name Petzl. Petzl lived most of his life in the village of Saint-Ismier (near Grenoble ), France at the foot of the mountain Dent De Crolles .

5. Jelly roll (battery) - Wikipedia

   en.wikipedia.org/wiki/Jelly_roll_(battery)

   The design has this name because the cross section of the battery looks like a Swiss roll. In this design, an insulating sheet is laid down, then a thin layer of an anode material is laid down, a separator layer is applied, and a cathode material is layered on top. This sandwich is then rolled up and inserted into a hollow cylinder casing.

6. Dual carbon battery - Wikipedia

   en.wikipedia.org/wiki/Dual_carbon_battery

   A dual carbon battery is a type of battery that uses graphite (or carbon) as both its cathode and anode material. Compared to lithium-ion batteries , dual-ion batteries (DIBs) require less energy and emit less CO 2 during production, have a reduced reliance on critical materials such as Ni or Co, and are more easily recyclable.

7. Petzl Croll - Wikipedia

   en.wikipedia.org/wiki/Petzl_Croll

   A Petzl Croll is an ascending device [1] used in caving and industrial rope access made by the French company Petzl. Its name comes from the town Crolles where Petzl's company headquarters are located but might also be a reference to the nearby cave system of the Dent de Crolles , the exploration of which triggered a lot of technical effort ...