# Relationship history for MSHA mine 1517695

Current hierarchy: **Charles  Collins → Calvary Coal Company, Inc → Greasy Creek #16**

- 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:** Thomas C  Lackey → Greasy Creek #16; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Collins → Greasy Creek #16; 1992-02-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Unicorn Mining Inc → Greasy Creek #16; 1995-07-01 to 1999-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Thomas C  Lackey → Unicorn Mining Inc; 1995-07-01 to 1999-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Carl  Kirk et al → Greasy Creek #16; 1998-02-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North Star Mining Inc → Greasy Creek #16; 1999-08-31 to 2001-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Kirk et al → North Star Mining Inc; 1999-08-31 to 2001-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Calvary Coal Company, Inc → Greasy Creek #16; 2001-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Collins → Calvary Coal Company, Inc; 2001-09-25 to current/open; source msha-controller-operator-history