# Relationship history for MSHA mine 0202217

Current hierarchy: **Sanders John & Fred Lorette → Mayer Mining & Material → Mayer Mining & Material**

- 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:** Mayer Mining & Material → Mayer Mining & Material; 1984-07-01 to 1985-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Sanders John & Fred Lorette → Mayer Mining & Material; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sanders John & Fred Lorette → Mayer Mining & Material; 1984-07-01 to 1985-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Overlooked Mine Company → Mayer Mining & Material; 1985-05-16 to 1985-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Myers Robert → Mayer Mining & Material; 1985-05-16 to 1985-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Myers Robert → Overlooked Mine Company; 1985-05-16 to 1985-12-09; source msha-controller-operator-history
- **operator_operates_mine:** Mayer Mining & Material → Mayer Mining & Material; 1985-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sanders John & Fred Lorette → Mayer Mining & Material; 1985-12-10 to current/open; source msha-controller-operator-history