# Relationship history for MSHA mine 2401550

Current hierarchy: **Mowlem John Plc → Westgate Mining & Construction Inc → Custer 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

- **controller_controls_mine:** Koppen Eckhardt M → Custer Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Don Holmes → Custer Mine; 1980-06-01 to 1980-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Rick D  Holmes → Custer Mine; 1980-06-01 to 1980-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Rick D  Holmes → Don Holmes; 1980-06-01 to 1980-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Koppen Mining Construction Corp → Custer Mine; 1980-10-01 to 1982-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Koppen Eckhardt M → Koppen Mining Construction Corp; 1980-10-01 to 1982-10-11; source msha-controller-operator-history
- **operator_operates_mine:** Westgate Mining & Construction Inc → Custer Mine; 1982-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mowlem John Plc → Custer Mine; 1982-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mowlem John Plc → Westgate Mining & Construction Inc; 1982-10-12 to current/open; source msha-controller-operator-history