# Relationship history for MSHA mine 1511349

Current hierarchy: **Oates Michael → Comcol Fuel Inc → Comcol No 1**

- 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:** Jessup T K → Comcol No 1; 1974-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T K Jessup Inc → Comcol No 1; 1978-06-01 to 1980-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Jessup T K → T K Jessup Inc; 1978-06-01 to 1980-03-03; source msha-controller-operator-history
- **operator_operates_mine:** Comcol Fuel Inc → Comcol No 1; 1980-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oates Michael → Comcol No 1; 1980-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oates Michael → Comcol Fuel Inc; 1980-03-04 to current/open; source msha-controller-operator-history