# Relationship history for MSHA mine 1511142

Current hierarchy: **Harris Richard → Bart Coal Company → 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:** H & R Coal Company Inc → No 1 Mine; 1978-04-01 to 1980-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Hall Wheeler Et Al → No 1 Mine; 1978-04-01 to 1980-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Hall Wheeler Et Al → H & R Coal Company Inc; 1978-04-01 to 1980-02-04; source msha-controller-operator-history
- **operator_operates_mine:** H & R Coal Company Inc → No 1 Mine; 1980-02-05 to 1981-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Napier Bill Et Al → No 1 Mine; 1980-02-05 to 1981-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Napier Bill Et Al → H & R Coal Company Inc; 1980-02-05 to 1981-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Bart Coal Company → No 1 Mine; 1981-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harris Richard → No 1 Mine; 1981-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harris Richard → Bart Coal Company; 1981-04-06 to current/open; source msha-controller-operator-history