# Relationship history for MSHA mine 3607108

Current hierarchy: **Robert R  Shingara → R S 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Derck Robert & Ralph Kissinger → No 1 Slope; 1981-02-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A & R Coal Company → No 1 Slope; 1981-03-01 to 1981-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Eby Richard & Alfred Berry → No 1 Slope; 1981-03-01 to 1981-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Eby Richard & Alfred Berry → A & R Coal Company; 1981-03-01 to 1981-11-24; source msha-controller-operator-history
- **operator_operates_mine:** K & D Coal Company → No 1 Slope; 1981-11-25 to 1989-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Derck Robert & Ralph Kissinger → K & D Coal Company; 1981-11-25 to 1989-08-20; source msha-controller-operator-history
- **operator_operates_mine:** R S Coal Company → No 1 Slope; 1989-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert R  Shingara → No 1 Slope; 1989-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert R  Shingara → R S Coal Company; 1989-08-21 to current/open; source msha-controller-operator-history