# Relationship history for MSHA mine 3503818

Current hierarchy: **Greg  Goss; Jacob  Hanning → Jack Robinson and Sons Inc → RC 2020**

- 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:** Ron  Robinson Jr → RC 2020; 1998-09-01 to 2016-04-12; source msha-controller-operator-history
- **operator_operates_mine:** 4 R Equipment L.L.C. → RC 2020; 2014-05-28 to 2020-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Robinson Jr → 4 R Equipment L.L.C.; 2014-05-28 to 2016-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Jacob L Hanning et al → RC 2020; 2016-03-01 to 2017-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Robinson Jr et al → RC 2020; 2016-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Robinson Jr et al → 4 R Equipment L.L.C.; 2016-04-13 to 2020-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Ryan C  Clark et al → 4 R Equipment L.L.C.; 2016-04-13 to 2020-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Greg  Goss et al → RC 2020; 2017-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jack Robinson and Sons Inc → RC 2020; 2020-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jacob L Hanning et al → Jack Robinson and Sons Inc; 2020-02-03 to 2017-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Robinson Jr. et al → Jack Robinson and Sons Inc; 2020-02-03 to 2017-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Goss et al → Jack Robinson and Sons Inc; 2020-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jacob  Hanning et al → Jack Robinson and Sons Inc; 2020-02-03 to current/open; source msha-controller-operator-history