# Relationship history for MSHA mine 4407284

Current hierarchy: **Paul R  Ison; Jessica B  Ison → Ambrose Branch Coal Company, Inc. → #2**

- 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

- **controller_controls_mine:** Paul R  Ison  et al → #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shelly B  Mullins et al → #2; 2008-07-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Contractors, Inc. → #2; 2011-06-15 to 2015-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Shelly B  Mullins et al → Appalachian Contractors, Inc.; 2011-06-15 to 2015-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth Darrell  Stanley Jr → #2; 2013-08-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big D Enterprises, Inc → #2; 2015-07-23 to 2018-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth Darrell  Stanley Jr → Big D Enterprises, Inc; 2015-07-23 to 2018-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey K Mullins et al → #2; 2015-12-28 to 2017-08-03; source msha-controller-operator-history
- **controller_controls_mine:** WC Ridgetop Holding Inc et al → #2; 2017-08-04 to 2021-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Ridgetop Development LLC → #2; 2018-09-04 to 2020-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey K Mullins et al → Ridgetop Development LLC; 2018-09-04 to 2017-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Energy, Incorporated et al → Ridgetop Development LLC; 2018-09-04 to 2017-08-03; source msha-controller-operator-history
- **controller_controls_operator:** WC Ridgetop Holding Inc et al → Ridgetop Development LLC; 2018-09-04 to 2020-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Energy, Incorporated et al → Ridgetop Development LLC; 2018-09-04 to 2020-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Big D Enterprises, Inc → #2; 2020-03-19 to 2022-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth Darrell  Stanley Jr → Big D Enterprises, Inc; 2020-03-19 to 2022-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Robert S  Toller → #2; 2021-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert S  Toller → Ridgetop Development LLC; 2021-12-01 to 2020-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Ambrose Branch Coal Company, Inc. → #2; 2022-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul R  Ison  et al → Ambrose Branch Coal Company, Inc.; 2022-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jessica B  Ison  et al → Ambrose Branch Coal Company, Inc.; 2022-09-12 to current/open; source msha-controller-operator-history