# Relationship history for MSHA mine 1512462

Current hierarchy: **Johnson Elmer R → Spontaneous Mining Company Inc → No1**

- 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:** Big Mac Coal Company Inc → No1; 1980-08-01 to 1982-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Booth Phillip G → No1; 1980-08-01 to 1982-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Booth Phillip G → Big Mac Coal Company Inc; 1980-08-01 to 1982-10-17; source msha-controller-operator-history
- **operator_operates_mine:** Shady Coal Inc → No1; 1982-10-18 to 1986-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Newman Russell → No1; 1982-10-18 to 1986-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Newman Russell → Shady Coal Inc; 1982-10-18 to 1986-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Spontaneous Mining Company Inc → No1; 1986-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Elmer R → No1; 1986-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Elmer R → Spontaneous Mining Company Inc; 1986-02-18 to current/open; source msha-controller-operator-history