# Relationship history for MSHA mine 3303673

Current hierarchy: **Kelm Warren E & Dwight A Ensley → K & R Mining Inc → K & R No 1 (Strip)**

- 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:** Keffler David K → K & R No 1 (Strip); 1974-11-01 to 1987-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Keffler & Rose Enterprises Inc → K & R No 1 (Strip); 1978-02-01 to 1986-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Keffler David K → Keffler & Rose Enterprises Inc; 1978-02-01 to 1986-06-30; source msha-controller-operator-history
- **operator_operates_mine:** K & R Mining Inc → K & R No 1 (Strip); 1986-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kelm Warren E & Dwight A Ensley → K & R No 1 (Strip); 1986-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelm Warren E & Dwight A Ensley → K & R Mining Inc; 1986-07-01 to current/open; source msha-controller-operator-history