# Relationship history for MSHA mine 1510030

Current hierarchy: **David F  May → D F M Inc → No. 1 Tipple**

- 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:** Western Coal Corp → No. 1 Tipple; 1976-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Delta Mining Company Inc → No. 1 Tipple; 1976-10-01 to 1984-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Western Coal Corp → Little Delta Mining Company Inc; 1976-10-01 to 1984-01-24; source msha-controller-operator-history
- **controller_controls_mine:** David F  May → No. 1 Tipple; 1983-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Katron Coal Corp → No. 1 Tipple; 1984-01-25 to 1987-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Neal Pete → No. 1 Tipple; 1984-01-25 to 1987-05-21; source msha-controller-operator-history
- **controller_controls_operator:** Neal Pete → Katron Coal Corp; 1984-01-25 to 1987-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Highlands Coal Sales Inc → No. 1 Tipple; 1987-05-22 to 2003-10-07; source msha-controller-operator-history
- **controller_controls_mine:** B W  McDonald → No. 1 Tipple; 1987-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B W  McDonald → Highlands Coal Sales Inc; 1987-05-22 to 2003-10-07; source msha-controller-operator-history
- **operator_operates_mine:** D F M Inc → No. 1 Tipple; 2003-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David F  May → D F M Inc; 2003-10-08 to current/open; source msha-controller-operator-history