# Relationship history for MSHA mine 0503785

Current hierarchy: **Siegrist Construction Company → Siegrist Construction Company → Pacific Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Siegrist Construction Company Et Al → Pacific Pit; 1978-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Siegrist Construction Company → Pacific Pit; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Siegrist Construction Company Et Al → Siegrist Construction Company; 1982-08-01 to current/open; source msha-controller-operator-history