# Relationship history for MSHA mine 1513211

Current hierarchy: **James  Parsons → J & L Drilling, Inc → #1 Processing Facility**

- 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:** Swanton Corp → #1 Processing Facility; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kenerco Corp → #1 Processing Facility; 1981-11-01 to 1982-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Swanton Corp → Kenerco Corp; 1981-11-01 to 1982-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Parthenos Coal Processing Company Inc → #1 Processing Facility; 1982-11-24 to 1983-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Davis Russell-Sun Belt Coal Sales Et Al → #1 Processing Facility; 1982-11-24 to 1983-12-18; source msha-controller-operator-history
- **controller_controls_operator:** Davis Russell-Sun Belt Coal Sales Et Al → Parthenos Coal Processing Company Inc; 1982-11-24 to 1983-12-18; source msha-controller-operator-history
- **operator_operates_mine:** Kenerco Corp → #1 Processing Facility; 1983-12-19 to 2001-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Swanton Corp → Kenerco Corp; 1983-12-19 to 2001-09-23; source msha-controller-operator-history
- **controller_controls_mine:** James  Parsons → #1 Processing Facility; 2001-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & L Drilling, Inc → #1 Processing Facility; 2001-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Parsons → J & L Drilling, Inc; 2001-09-24 to current/open; source msha-controller-operator-history