# Relationship history for MSHA mine 3602123

Current hierarchy: **Thomas  Klinger; Don  Zeigler → F K Z Coal Inc → No 1 Slope**

- 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:** G M P Coal Co Inc → No 1 Slope; 1950-01-01 to 1997-03-30; source msha-controller-operator-history
- **controller_controls_mine:** G M P Coal Company → No 1 Slope; 1950-01-01 to 1997-03-30; source msha-controller-operator-history
- **controller_controls_operator:** G M P Coal Company → G M P Coal Co Inc; 1950-01-01 to 1997-03-30; source msha-controller-operator-history
- **operator_operates_mine:** F K Z Coal Inc → No 1 Slope; 1997-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Klinger et al → No 1 Slope; 1997-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Klinger et al → F K Z Coal Inc; 1997-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Zeigler et al → F K Z Coal Inc; 1997-03-31 to current/open; source msha-controller-operator-history