# Relationship history for MSHA mine 0405183

Current hierarchy: **Foss Harold → Caltalc Inc → K-1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Caltalc Inc → K-1 PIT; 1992-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Foss Harold → K-1 PIT; 1992-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Foss Harold → Caltalc Inc; 1992-05-01 to current/open; source msha-controller-operator-history