Why Is There No Schlage "D" Keyway? [#SchlageWeek Day 4]

Almost everyone is familiar with the Schlage "C" keyway. Some of you, after watching these videos this week, are now aware of Schlage's "E" and "F" and "G" keyways. But why does the series start with "C"? What were the "A" and "B" keyways? And -- most baffling to me -- why is there no "D" keyway?? Well, after a lot of searching, I finally found the answer! I hope you enjoy #SchlageWeek ! Aging Wheels on YouTube...    / agingwheels   InRangeTV on YouTube...    / @inrangetv   Technology Connections on YouTube...    / technologyconnections   Lishi SC20 2-in-1 pick... https://redteamtools.com/Lishi-2-in-1... -- ----- ---------- Sign up for give-away drawings here... https://deviating.net/contests/give-a... I'm on Twitter. I mostly use it for swearing...   / deviantollam   I'm also on Instagram. I mostly use it for liking my friends' photos...   / deviantollam   This is my GitHub. I don't use it much at all, but I do post my design files there... https://github.com/deviantollam This is my personal web site. Most things i create wind up online... https://deviating.net This is my company. We're good at stuff... https://enterthecore.net This is where i train. Come and learn badass skills... https://redteamalliance.com -- ----- ----------