# Relationship history for MSHA mine 1400411

Current hierarchy: **Brian G Keener → Independent Salt Company → Independent Salt Company**

- 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

- **operator_operates_mine:** Independent Salt Company → Independent Salt Company; 1950-01-01 to 1989-11-09; source msha-controller-operator-history
- **controller_controls_mine:** George R  Beach → Independent Salt Company; 1950-01-01 to 1989-11-09; source msha-controller-operator-history
- **controller_controls_operator:** George R  Beach → Independent Salt Company; 1950-01-01 to 1989-11-09; source msha-controller-operator-history
- **operator_operates_mine:** Independent Salt Company → Independent Salt Company; 1989-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** M D  Keener → Independent Salt Company; 1989-11-10 to 2011-10-31; source msha-controller-operator-history
- **controller_controls_operator:** M D  Keener → Independent Salt Company; 1989-11-10 to 2011-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Brian G Keener et al → Independent Salt Company; 2011-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian G Keener et al → Independent Salt Company; 2011-11-01 to current/open; source msha-controller-operator-history