# Relationship history for MSHA mine 0102247

Current hierarchy: **Echols Michael → Riverside Materials Inc → Riverside Materials**

- 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:** Jones Robert L → Riverside Materials; 1979-05-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bulk Materials Inc → Riverside Materials; 1980-09-01 to 1981-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Jones Robert L → Bulk Materials Inc; 1980-09-01 to 1981-12-09; source msha-controller-operator-history
- **operator_operates_mine:** Riverside Materials Inc → Riverside Materials; 1981-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Echols Michael → Riverside Materials; 1981-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Echols Michael → Riverside Materials Inc; 1981-12-10 to current/open; source msha-controller-operator-history