# Relationship history for MSHA mine 3601998

Current hierarchy: **Sponenburg Fredrick E → Sharp Mountain Coal Company Inc → No 1 Drift**

- 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:** F G G & L Coal Company → No 1 Drift; 1950-01-01 to 1976-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Lucas Ricky Et Al → No 1 Drift; 1950-01-01 to 1976-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Lucas Ricky Et Al → F G G & L Coal Company; 1950-01-01 to 1976-04-21; source msha-controller-operator-history
- **operator_operates_mine:** Sharp Mountain Coal Company → No 1 Drift; 1976-04-22 to 1979-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Koppenhaver Howard → No 1 Drift; 1976-04-22 to 1979-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Koppenhaver Howard → Sharp Mountain Coal Company; 1976-04-22 to 1979-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Sharp Mountain Coal Company → No 1 Drift; 1979-02-22 to 1981-04-26; source msha-controller-operator-history
- **controller_controls_mine:** Donofrio Robert Et Al → No 1 Drift; 1979-02-22 to 1984-07-02; source msha-controller-operator-history
- **controller_controls_operator:** Donofrio Robert Et Al → Sharp Mountain Coal Company; 1979-02-22 to 1981-04-26; source msha-controller-operator-history
- **operator_operates_mine:** Sharp Mountain Coal Company → No 1 Drift; 1981-04-27 to 1983-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Woll John W Et Al → No 1 Drift; 1981-04-27 to 1983-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Woll John W Et Al → Sharp Mountain Coal Company; 1981-04-27 to 1983-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Sharp Mountain Coal Company → No 1 Drift; 1983-11-08 to 1984-07-02; source msha-controller-operator-history
- **controller_controls_operator:** Donofrio Robert Et Al → Sharp Mountain Coal Company; 1983-11-08 to 1984-07-02; source msha-controller-operator-history
- **operator_operates_mine:** Sharp Mountain Coal Company Inc → No 1 Drift; 1984-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sponenburg Fredrick E → No 1 Drift; 1984-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sponenburg Fredrick E → Sharp Mountain Coal Company Inc; 1984-07-03 to current/open; source msha-controller-operator-history