Editing Hi-Tek High Profile (section)

==Description==
The design depicted in the patent, with circular sliders, was designed for calculator keypads. In order to support full-size keyboards, a new grid system was introduced, made from discrete single-key mould units that could be assembled to mould entire keyboards; prior to this, it seems that the mould layout was entirely static.<ref name="Corr-DH-SK-1" /> Thin ridges around the grid walls demonstrate where the mould units are placed together to generate the overall grid moulding.

Each switch position takes up the entire [[unit]]. Since the contact and slider portion only needs to occupy the centre, the rest of the assembly is mostly empty space, with a wall around each switch position and bracing struts up to the centre shaft. The appearance of this largely-empty grid earned the design the nickname "waffle frame".

The switch contacts are a pair of vertical leaf springs placed side by side, that are held apart by a horizontal bar in the [[slider]]. When the slider is depressed, the bar is lowered and the contacts close. The slider is hollow, and the contacts are exposed when the keycap is removed. The return spring has a tight cluster of turns in the centre as well as at each end; this and the general design of the contacts are both found in the successor [[Hi-Tek Series 725]].

Slightly prior to Series 725, Hi-Tek later introduced [[Hi-Tek Dovetail Series|Dovetail Series]], a modular, interlocking revision of the High Profile design that allowed for easier and cheaper construction of custom keyboards. Instead of requiring a full custom mould arrangement for each new keyboard, discrete and semi-discrete switches together with spacers could be joined together to form a larger grid.

===Recognition===
{{main|Hi-Tek and Stackpole recognition}}

In many cases, Hi-Tek supplied only the [[switch grid]], leaving the customer to supply the PCB and logic circuitry.<ref name="DMilo-T" /> The result of this is that may Hi-Tek switch grids have no branding; branding on the original-style switch grids is extremely rare. Hi-Tek as a manufacturer is generally confirmed by branding on the [[PCB]], in the instances where Hi-Tek supplied complete keyboard assemblies.<ref>Deskthority — [https://deskthority.net/photos-f62/hi-tek-keyboard-t12653.html Hi-Tek keyboard]</ref> With flat-top grids, however, the Hi-Tek branding is placed above the space bar.

As Stackpole grids are also frequently unbranded in the same manner, this created much confusion about differentiating Stackpole and Hi-Tek grids. However, the distinctions between the two now seem fairly clear.