# Relationship history for MSHA mine 3606130

Current hierarchy: **Derck Robert & Ralph Kissinger → K & D Coal Company → No 1 Slope**

- 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

- **operator_operates_mine:** R L M Coal Company → No 1 Slope; 1976-07-01 to 1979-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Myers Lee & Garry Rebuck → No 1 Slope; 1976-07-01 to 1979-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Myers Lee & Garry Rebuck → R L M Coal Company; 1976-07-01 to 1979-03-22; source msha-controller-operator-history
- **operator_operates_mine:** C & K Coal Company → No 1 Slope; 1979-03-23 to 1981-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Long Clark E Jr & Harry L Rebuck → No 1 Slope; 1979-03-23 to 1981-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Long Clark E Jr & Harry L Rebuck → C & K Coal Company; 1979-03-23 to 1981-02-24; source msha-controller-operator-history
- **operator_operates_mine:** K & D Coal Company → No 1 Slope; 1981-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Derck Robert & Ralph Kissinger → No 1 Slope; 1981-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derck Robert & Ralph Kissinger → K & D Coal Company; 1981-02-25 to current/open; source msha-controller-operator-history