# Relationship history for MSHA mine 0102833

Current hierarchy: **Otis R  Robison Jr → R J R Mining Company Inc → Helms 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Reid Dolores → Helms Mine; 1982-02-01 to 2002-09-30; source msha-controller-operator-history
- **operator_operates_mine:** New Acton Coal Mining Company Inc → Helms Mine; 1989-11-01 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Reid Dolores → New Acton Coal Mining Company Inc; 1989-11-01 to 1991-02-28; source msha-controller-operator-history
- **operator_operates_mine:** R J R Mining Company Inc → Helms Mine; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy C  Johnson et al → Helms Mine; 1991-03-01 to 2019-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Randy C  Johnson et al → R J R Mining Company Inc; 1991-03-01 to 2019-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Blossom  Nelson et al → R J R Mining Company Inc; 1991-03-01 to 2019-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Robert J  Reed Sr → Helms Mine; 2002-10-01 to 2012-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert J  Reed Sr → New Acton Coal Mining Company Inc; 2002-10-01 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_mine:** TRU Energy Services LLC → Helms Mine; 2012-09-01 to 2012-10-29; source msha-controller-operator-history
- **controller_controls_operator:** TRU Energy Services LLC → New Acton Coal Mining Company Inc; 2012-09-01 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_mine:** NACCO Industries Inc → Helms Mine; 2012-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** NACCO Industries Inc → New Acton Coal Mining Company Inc; 2012-10-30 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Melvin  Bailey et al → Helms Mine; 2019-10-15 to 2020-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Melvin  Bailey et al → R J R Mining Company Inc; 2019-10-15 to 2020-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Johnson et al → R J R Mining Company Inc; 2019-10-15 to 2020-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Otis R Robison Jr et al → R J R Mining Company Inc; 2019-10-15 to 2020-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Melvin  Bailey et al → Helms Mine; 2020-02-18 to 2020-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Melvin  Bailey et al → R J R Mining Company Inc; 2020-02-18 to 2020-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Otis R Robison Jr. et al → R J R Mining Company Inc; 2020-02-18 to 2020-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Otis R  Robison Jr → Helms Mine; 2020-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Otis R  Robison Jr → R J R Mining Company Inc; 2020-07-22 to current/open; source msha-controller-operator-history