# Relationship history for MSHA mine 1700290

Current hierarchy: **James L  Bishop; John L  Bishop Jr → Bishop Concrete LLC → Brownville Junction Pit and Mill**

- 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:** John L Bishop & Sons → Brownville Junction Pit and Mill; 1950-01-01 to 2016-10-17; source msha-controller-operator-history
- **controller_controls_mine:** J L  Bishop → Brownville Junction Pit and Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J L  Bishop → John L Bishop & Sons; 1950-01-01 to 2016-10-17; source msha-controller-operator-history
- **operator_operates_mine:** Bishop Concrete LLC → Brownville Junction Pit and Mill; 2016-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James L  Bishop et al → Brownville Junction Pit and Mill; 2016-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L  Bishop et al → Bishop Concrete LLC; 2016-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L  Bishop Jr et al → Bishop Concrete LLC; 2016-10-18 to current/open; source msha-controller-operator-history