Historical clue formulations

• Mobile library? — 2026-09-05
• Volume control device? — 2026-08-22
• Novel technology? — 2025-01-25
• Nook, e.g. — 2022-12-15
• Kindle or Nook — 2022-11-08
• Aid for going paperless — 2022-07-02
• Travel item for bookworms — 2021-08-20
• Kindle, e.g. ... or a hint to this puzzle's theme? — 2021-07-14
• Novel convenience? — 2021-06-13
• Nook, e.g. — 2020-04-08
• Literary convenience — 2020-03-11
• Device on which to get texts — 2019-10-22
• One use for a tablet — 2019-05-24
• Kindle, for one — 2018-07-31
• Kindle or Nook — 2017-01-23
• Something you can control the volume with? — 2016-10-14
• Portable device for book lovers — 2015-07-06
• Kindle, e.g. — 2015-04-05