# Relationship history for MSHA mine 1510608

Current hierarchy: **Maynard John → Dusty Bee Coal Company Inc → No 2 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:** Murray G Dale & Jan Gorgen → No 2 Mine; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little Hackney Creek Coal Company → No 2 Mine; 1977-08-01 to 1980-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Murray G Dale & Jan Gorgen → Little Hackney Creek Coal Company; 1977-08-01 to 1980-02-24; source msha-controller-operator-history
- **operator_operates_mine:** Dusty Bee Coal Company Inc → No 2 Mine; 1980-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Maynard John → No 2 Mine; 1980-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maynard John → Dusty Bee Coal Company Inc; 1980-02-25 to current/open; source msha-controller-operator-history