# Relationship history for MSHA mine 4405203

Current hierarchy: **Zambacca Richard → Jill Ann Coal Company Inc → No 1 Mine**

- 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:** Jill Ann Coal Company Inc → No 1 Mine; 1979-04-01 to 1980-12-08; source msha-controller-operator-history
- **controller_controls_mine:** William P  Harris et al → No 1 Mine; 1979-04-01 to 1980-12-08; source msha-controller-operator-history
- **controller_controls_operator:** William P  Harris et al → Jill Ann Coal Company Inc; 1979-04-01 to 1980-12-08; source msha-controller-operator-history
- **operator_operates_mine:** Jill Ann Coal Company Inc → No 1 Mine; 1980-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zambacca Richard Et Al → No 1 Mine; 1980-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zambacca Richard Et Al → Jill Ann Coal Company Inc; 1980-12-09 to current/open; source msha-controller-operator-history