# Relationship history for MSHA mine 2400104

Current hierarchy: **Tonnemaker F Clayton → Coal Creek Mining Company → Coal Creek Mine**

- 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:** John H Schoonover → Coal Creek Mine; 1950-01-01 to 1976-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Schoonover John H → Coal Creek Mine; 1950-01-01 to 1976-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Schoonover John H → John H Schoonover; 1950-01-01 to 1976-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Coal Creek Mining Company → Coal Creek Mine; 1976-09-24 to 1978-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Schmidt R H → Coal Creek Mine; 1976-09-24 to 1978-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Schmidt R H → Coal Creek Mining Company; 1976-09-24 to 1978-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Coal Creek Mining Company → Coal Creek Mine; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tonnemaker F Clayton → Coal Creek Mine; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tonnemaker F Clayton → Coal Creek Mining Company; 1978-04-01 to current/open; source msha-controller-operator-history