# Relationship history for MSHA mine 4607079

Current hierarchy: **Alvis  Porter → Southern Construction Inc → No 1 Load-Out (1)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Peres Processing Company Inc → No 1 Load-Out (1); 1986-02-01 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_mine:** James B  Simpkins → No 1 Load-Out (1); 1986-02-01 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_operator:** James B  Simpkins → Peres Processing Company Inc; 1986-02-01 to 1990-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Peres Processing Inc → No 1 Load-Out (1); 1990-08-01 to 1995-01-02; source msha-controller-operator-history
- **controller_controls_mine:** NSM PLC → No 1 Load-Out (1); 1990-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** NSM PLC → Peres Processing Inc; 1990-08-01 to 1995-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Excavating Inc → No 1 Load-Out (1); 1995-01-03 to 1995-01-26; source msha-controller-operator-history
- **controller_controls_mine:** Latham Charles D → No 1 Load-Out (1); 1995-01-03 to 1996-05-27; source msha-controller-operator-history
- **controller_controls_operator:** Latham Charles D → Appalachian Excavating Inc; 1995-01-03 to 1995-01-26; source msha-controller-operator-history
- **operator_operates_mine:** Southern Construction Inc → No 1 Load-Out (1); 1995-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alvis  Porter → No 1 Load-Out (1); 1995-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alvis  Porter → Southern Construction Inc; 1995-01-27 to current/open; source msha-controller-operator-history