I distinctly remember stores having to use the old-fashioned "knuckle-scraper" credit card machines after hurricane Katrina in Baton Rouge because phone lines w

I distinctly remember stores having to use the old-fashioned "knuckle-scraper" credit card machines after hurricane Katrina in Baton Rouge because phone lines were down. It basically took an impression of the card from the raised letters of the card. Not many places had one of these and some just had to close because it didn't take long for all their customers to run out of cash without atms. Nowadays my credit card doesn't even have the raised bumps anymore. The knuckle-scrapers were a wide open vector for fraud but did at least work in a natural disaster.