{"subject_places": ["United States"], "subjects": ["Rates", "Telephone"], "key": "/works/OL7251865W", "title": "Development of separations principles in the telephone industry", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL2108385A"}}], "type": {"key": "/type/work"}, "covers": [14944309], "latest_revision": 3, "revision": 3, "created": {"type": "/type/datetime", "value": "2009-12-10T20:43:12.585077"}, "last_modified": {"type": "/type/datetime", "value": "2025-04-30T09:17:27.449013"}}