# Relationship history for MSHA mine 4407417

Current hierarchy: **Bernie  Mason; David  Ison → Appalachian Development → Mill Creek No. 1 Surface**

- 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

- **controller_controls_mine:** Jeffrey K Mullins et al → Mill Creek No. 1 Surface; 2015-12-28 to 2017-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Energy, Incorporated et al → Mill Creek No. 1 Surface; 2017-08-04 to 2021-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Ridgetop Development LLC → Mill Creek No. 1 Surface; 2021-12-01 to 2022-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey K Mullins et al → Ridgetop Development LLC; 2021-12-01 to 2017-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Energy, Incorporated et al → Ridgetop Development LLC; 2021-12-01 to 2017-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Energy, Incorporated et al → Ridgetop Development LLC; 2021-12-01 to 2021-11-30; source msha-controller-operator-history
- **controller_controls_operator:** WC Ridgetop Holding Inc et al → Ridgetop Development LLC; 2021-12-01 to 2021-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert S  Toller → Mill Creek No. 1 Surface; 2021-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert S  Toller → Ridgetop Development LLC; 2021-12-01 to 2022-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Development → Mill Creek No. 1 Surface; 2022-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Johnson et al → Mill Creek No. 1 Surface; 2022-04-17 to 2023-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Johnson et al → Appalachian Development; 2022-04-17 to 2023-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Bernie  Mason et al → Appalachian Development; 2022-04-17 to 2023-08-14; source msha-controller-operator-history
- **controller_controls_mine:** David  Ison et al → Mill Creek No. 1 Surface; 2023-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Ison et al → Appalachian Development; 2023-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bernie  Mason et al → Appalachian Development; 2023-08-15 to current/open; source msha-controller-operator-history