# Relationship history for MSHA mine 3608051

Current hierarchy: **Brantner Melvin A → Joffre Coal & Construction Inc → Brm 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:** Bituminous Resource Management Inc → Brm No 1 Mine; 1988-10-01 to 1989-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Kohl David C → Brm No 1 Mine; 1988-10-01 to 1989-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Kohl David C → Bituminous Resource Management Inc; 1988-10-01 to 1989-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Joffre Coal & Construction Inc → Brm No 1 Mine; 1989-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brantner Melvin A → Brm No 1 Mine; 1989-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brantner Melvin A → Joffre Coal & Construction Inc; 1989-11-14 to current/open; source msha-controller-operator-history