C3 PRESS KIT — Tetra720 LLC, Chicago
October 2026

Thank you for looking at C3. Everything in this folder may be reproduced
freely; credit "Tetra720" where a credit is customary.

WHAT'S HERE
  C3-press-release-2026-10-07.txt     the current release, plain text
  tetra720-logo-1400.png              Tetra720 logo, 1400 x 1400, black on white
  john-christy-headshot.jpg           John Christy, founder (768 x 768)
  john-christy-archive.png            John Christy, archive photo (1102 x 1356)

  Drawings made by C3 Assistant from a single typed description, no hand editing:
  c3-assistant-17-bolt-circle-flange.png        mechanical — flange with hole table
  c3-assistant-18-one-bedroom-apartment.png     architectural — floor plan
  c3-assistant-09-beam-shear-moment.png         structural — beam, shear & moment
  c3-assistant-02-thin-lens-ray-diagram.png     optics
  c3-assistant-11-phasor-diagram-rl.png         electrical — series RL phasor
  c3-assistant-22-isometric-stair.png           pictorial — five-step stair
  c3-assistant-06-four-bar-linkage.png          mechanism — crank-rocker
  c3-assistant-24-bookcase-cut-list.png         woodworking — bookcase with cut list

  C3 at work, full application window:
  c3-gdt-feature-control-frames.jpg             GD&T sheet — frames, datums, tolerances
  c3-room-scanner-floor-plan.jpg                floor plan from an iPhone LiDAR scan

THERE IS MUCH MORE ON THE SITE
  https://tetra720.com/assistant.html   26 Assistant-made drawings, each shown
                                        with the exact request that produced it
  https://tetra720.com/features.html    full feature tour, with screenshots
  https://tetra720.com/story.html       1982 to today: CADD/85, the HP catalog,
                                        Hughes Aircraft, a 1986 drawing reopened in C3
  https://tetra720.com/press/           this kit, always current
  https://tetra720.com                  the product

A live demonstration, a drawing made to your own brief, any screenshot at
any resolution, and photographs from the 1980s archive are yours for the
asking.

John Christy, Founder
Tetra720 LLC — Chicago
john@tetra720.com
