# Relationship history for MSHA mine 1509505

Current hierarchy: **Shepherd Sim & Joe → J & S Coal Company → 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:** K C B Coal Inc → No 1 Mine; 1976-02-01 to 1977-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Rasnick Elmer → No 1 Mine; 1976-02-01 to 1977-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Rasnick Elmer → K C B Coal Inc; 1976-02-01 to 1977-08-30; source msha-controller-operator-history
- **operator_operates_mine:** J & S Coal Company → No 1 Mine; 1977-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shepherd Sim & Joe → No 1 Mine; 1977-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shepherd Sim & Joe → J & S Coal Company; 1977-08-31 to current/open; source msha-controller-operator-history