# Relationship history for MSHA mine 1500600

Current hierarchy: **Jackson Roy Dan → Ky High Grade Coal Company Inc → No 1 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

- **operator_operates_mine:** Dry Lake Coal Company Inc → No 1 Mine; 1950-01-01 to 1976-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Turner → No 1 Mine; 1950-01-01 to 1976-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Turner → Dry Lake Coal Company Inc; 1950-01-01 to 1976-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Jackson Roy Dan → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dry Lake Coal Company Inc → No 1 Mine; 1976-06-01 to 1978-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Jackson Roy Dan → Dry Lake Coal Company Inc; 1976-06-01 to 1978-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Dry Lake Coal Company Inc → No 1 Mine; 1978-04-01 to 1979-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Turner Charles & Bobby Joe Hensley → No 1 Mine; 1978-04-01 to 1980-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Turner Charles & Bobby Joe Hensley → Dry Lake Coal Company Inc; 1978-04-01 to 1979-04-08; source msha-controller-operator-history
- **operator_operates_mine:** Ky High Grade Coals Inc → No 1 Mine; 1979-04-09 to 1980-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Middleton Wendell L → No 1 Mine; 1979-04-09 to 1980-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Middleton Wendell L → Ky High Grade Coals Inc; 1979-04-09 to 1980-03-05; source msha-controller-operator-history
- **operator_operates_mine:** Ky High Grade Coal Company Inc → No 1 Mine; 1980-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jackson Roy Dan → No 1 Mine; 1980-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jackson Roy Dan → Ky High Grade Coal Company Inc; 1980-03-06 to current/open; source msha-controller-operator-history