Related Clues:
- Typists hit them
- Piano's 'ivories'
- They open doors
- Ace Hardware offerings
- Typically lost items that are 'found' in the starts of 16-, 24-, 45- and 57-Across
- Things janitors keep on rings
- Much of a typewriter
- Custodian's ringfull
- They're depressed during recitals
- Parts of accordions
- Hammers and sickles
- Esc and Tab
- They're pressed by pianists
- A piano has 88 of them
- A piano has dozens of them