# Relationship history for MSHA mine 1510117

Current hierarchy: **Guerra Lonzo → Straight Fork Coal Company Inc → #2 Processing Plant**

- 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

- **operator_operates_mine:** Excello Coal Corp Of Ky → #2 Processing Plant; 1976-11-15 to 1979-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Excello Coal Corp → #2 Processing Plant; 1976-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Excello Coal Corp → Excello Coal Corp Of Ky; 1976-11-15 to 1979-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Edmond Coal Company Inc → #2 Processing Plant; 1979-07-16 to 1981-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Montrie E F → #2 Processing Plant; 1979-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Montrie E F → Edmond Coal Company Inc; 1979-07-16 to 1981-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Guerra Lonzo → #2 Processing Plant; 1980-08-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Straight Fork Coal Company Inc → #2 Processing Plant; 1981-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Guerra Lonzo → Straight Fork Coal Company Inc; 1981-08-26 to current/open; source msha-controller-operator-history