# Relationship history for MSHA mine 5400077

Current hierarchy: **Santos Jose A → Santos Aggregates Inc → Planta #2**

- 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:** Santos Sand & Gravel Inc → Planta #2; 1978-03-09 to 1981-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Santos Antonio → Planta #2; 1978-03-09 to 1981-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Santos Antonio → Santos Sand & Gravel Inc; 1978-03-09 to 1981-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Santos Aggregates Inc → Planta #2; 1981-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Santos Jose A → Planta #2; 1981-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Santos Jose A → Santos Aggregates Inc; 1981-04-29 to current/open; source msha-controller-operator-history