They're punched at work

Usage examples of timecards.

Guides had to remind most of them to slide credit-card-sized Timecards through the encoder at the bottom of the ramp.

She wondered just how many timecards, under how many names, the snake owned.

Both men waited until they'd descended the ramp all the way, passing their timecards through the automatic reader at the bottom of the ramp, to be updated in a Time Tours effort to keep its customers from shadowing themselves.

When tourists use the gates, their Timecards are encoded-in both directions-going down time and coming back-so they have a record of when they've been.

Then the office area with a desk and a few old file cabinets and a time clock on the wall, a rack of timecards, the potbellied stove, a toolchest, a few picks and shovels in a rusty tangle, a calendar showing a blonde in a bikini.