# Relationship history for MSHA mine 1511416

Current hierarchy: **James  Parsons → J & L Drilling, Inc → Shamrock Loadout**

- 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:** B Ray  Thompson → Shamrock Loadout; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Coal Company Inc → Shamrock Loadout; 1978-07-01 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_operator:** B Ray  Thompson → Shamrock Coal Company Inc; 1978-07-01 to 1979-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Coal Company Inc → Shamrock Loadout; 1979-11-01 to 2002-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Sunoco, Inc. → Shamrock Loadout; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sunoco, Inc. → Shamrock Coal Company Inc; 1979-11-01 to 2002-07-02; source msha-controller-operator-history
- **controller_controls_mine:** James  Parsons → Shamrock Loadout; 2001-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & L Drilling, Inc → Shamrock Loadout; 2002-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Parsons → J & L Drilling, Inc; 2002-07-03 to current/open; source msha-controller-operator-history