# Relationship history for MSHA mine 1516848

Current hierarchy: **Francis Samuel S → Canyon Coals Inc → Jacobs Creek 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:** Canyon Coals Inc → Jacobs Creek Mine; 1990-03-01 to 1991-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Graber Jesse Jr Et Al → Jacobs Creek Mine; 1990-03-01 to 1991-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Graber Jesse Jr Et Al → Canyon Coals Inc; 1990-03-01 to 1991-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Canyon Coals Inc → Jacobs Creek Mine; 1991-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Francis Samuel S → Jacobs Creek Mine; 1991-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francis Samuel S → Canyon Coals Inc; 1991-08-15 to current/open; source msha-controller-operator-history