{"covers": [5699472], "first_publish_date": "1920", "key": "/works/OL157175W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL2164374A"}}], "subjects": ["Radio", "Telegraph, Wireless", "Wireless Telegraph"], "title": "Radio engineering principles", "type": {"key": "/type/work"}, "description": {"type": "/type/text", "value": "Batcheller Collection."}, "latest_revision": 5, "revision": 5, "created": {"type": "/type/datetime", "value": "2009-10-20T03:37:16.869534"}, "last_modified": {"type": "/type/datetime", "value": "2025-12-10T20:18:06.811091"}}