What were punch cards and how did they change business?

P H Grinyer MBCS shares his memories of punch cards, their uses, evolution and a family celebration.

Early Card Punch Machines

History

Punch Cards - SignsRX

Loyalty Punch Cards, The Pros & Cons

I filled my punch card at a local coffee shop, but the next day I went and they had closed the business. : r/firstworldproblems

History

Looking for a Punch Card App? 3 Things You Need to Know.

Classic Company Reward Punch Cards

The punched card

Business Card, Punch Card, 1000 Min. - www.

What is a Punch Card?

Koyal Wholesale Vintage Kraft Brown Reward Punch Cards, Loyalty Cards for Small Business Customers, 100-Pack

PoPETs Proceedings — Fast Privacy-Preserving Punch Cards