# Relationship history for MSHA mine 1508067

Current hierarchy: **May Victor → May Coal Company → No 6 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** May Victor → No 6 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Collins Bobby Et Al → No 6 Mine; 1974-01-01 to 1977-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Rawhide Coal Company Inc → No 6 Mine; 1975-01-01 to 1975-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Collins Bobby Et Al → Rawhide Coal Company Inc; 1975-01-01 to 1975-02-24; source msha-controller-operator-history
- **operator_operates_mine:** May Coal Company → No 6 Mine; 1975-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** May Victor → May Coal Company; 1975-02-25 to current/open; source msha-controller-operator-history