# Relationship history for MSHA mine 2902504

Current hierarchy: **Brian T  Etchison; Ralph E  Janes IV → R.E. Janes Gravel Co. → Plant #7**

- 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:** Ralph E  Janes III → Plant #7; 1950-01-01 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Brian T  Etchison et al → Plant #7; 2014-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R.E. Janes Gravel Co. → Plant #7; 2018-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian T  Etchison et al → R.E. Janes Gravel Co.; 2018-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph E  Janes IV et al → R.E. Janes Gravel Co.; 2018-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph E  Janes III → R.E. Janes Gravel Co.; 2018-10-01 to 2013-12-31; source msha-controller-operator-history