# Relationship history for MSHA mine 0102008

Current hierarchy: **Jones Robert L → Bulk Materials Inc → Bulk Materials Plant**

- 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:** Bulk Sand & Gravel Inc → Bulk Materials Plant; 1979-01-01 to 1979-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Wood Kenneth → Bulk Materials Plant; 1979-01-01 to 1980-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Wood Kenneth → Bulk Sand & Gravel Inc; 1979-01-01 to 1979-05-23; source msha-controller-operator-history
- **operator_operates_mine:** Bulk Materials Inc → Bulk Materials Plant; 1979-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones Robert L → Bulk Materials Plant; 1979-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Robert L → Bulk Materials Inc; 1979-05-24 to current/open; source msha-controller-operator-history