# Relationship history for MSHA mine 3700206

Current hierarchy: **Brett T  Richmond → Richmond LLC → Richmond LLC**

- 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

- **operator_operates_mine:** Roy B. Richmond Inc. → Richmond LLC; 2008-12-10 to 2015-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Roy B  Richmond et al → Richmond LLC; 2008-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy B  Richmond et al → Roy B. Richmond Inc.; 2008-12-10 to 2015-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Gail T  Richmond et al → Roy B. Richmond Inc.; 2008-12-10 to 2015-08-30; source msha-controller-operator-history
- **operator_operates_mine:** Richmond LLC → Richmond LLC; 2015-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brett T  Richmond → Richmond LLC; 2015-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brett T  Richmond → Richmond LLC; 2015-08-31 to current/open; source msha-controller-operator-history