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2. Philishave - Wikipedia

   en.wikipedia.org/wiki/Philishave

   An exception is the 6000 series which takes HQ8 heads. [6] Although the heads do look much the same, attempts to fit the wrong HQ number may fail; for example, an HQ5 head will not correctly engage with the spindle on a shaver model designed for an HQ3 or HQ4 head, due to a small extra piece of plastic in the centre of the HQ5 drive socket.

3. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.