I remember working with carbon paper, before every office had a copy machine, we used carbon paper to produce copies of contracts to build homes. It was fussy stuff, but with a little care, and a hard press it did the job. For simple change orders we used carbonless (NCR) forms.
I remember buying my first copy machine in 1988. I was working a project near the University of Central Florida. One of my customers brought in his brother to buy a house one morning. The brother sold copy machines for a living. We talked, be bought a house, I bought a copy machine. It was around $1,000, and does less than the $150 HP that I have at home today. Within a couple of days, I had someone in, who was looking at a new design, that we didn't have flyers on. I copied the floor plan from the blueprints, she showed them to her husband that evening, and came back the next morning to buy. Having the machine, resulted in an extra sale that I might have otherwise missed. That $1,000 machine, made me a lot of money. A year or so later, the company caught on, and started buying machines for every office.
I was surprised to see this in use, in a hardware store in a small town in northern Ohio this month. I wonder if someone is still printing the forms, or if they stocked up on a lifetime supply.