# Relationship history for MSHA mine 4605446

Current hierarchy: **Hylton Charles R → Princeton Coal Group Inc → Camelot**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Massey Energy Company → Camelot; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Trace Fork Coal Company → Camelot; 1979-04-01 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Trace Fork Coal Company; 1979-04-01 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Osborne  et al → Camelot; 1985-09-09 to 1990-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Soho Coal Company Inc → Camelot; 1986-05-01 to 1987-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Osborne  et al → Soho Coal Company Inc; 1986-05-01 to 1987-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Center Coal Company Inc → Camelot; 1987-09-25 to 1988-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Lawson Edward → Camelot; 1987-09-25 to 1988-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Lawson Edward → Center Coal Company Inc; 1987-09-25 to 1988-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Roberts Mining Inc → Camelot; 1988-04-18 to 1989-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Herbert D  Roberts → Camelot; 1988-04-18 to 1989-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Herbert D  Roberts → Roberts Mining Inc; 1988-04-18 to 1989-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Princeton Coal Group Inc → Camelot; 1989-06-29 to 1990-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Charles Robert B → Camelot; 1989-06-29 to 1990-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Charles Robert B → Princeton Coal Group Inc; 1989-06-29 to 1990-03-04; source msha-controller-operator-history
- **operator_operates_mine:** Princeton Coal Group Inc → Camelot; 1990-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hylton Charles R → Camelot; 1990-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hylton Charles R → Princeton Coal Group Inc; 1990-03-05 to current/open; source msha-controller-operator-history