# Relationship history for MSHA mine 0801227

Current hierarchy: **Marla Sue  Blue → Blue Rok Incorporated → Blue Rok Incorporated**

- 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:** Steinhatchee Construction & Development Co Inc → Blue Rok Incorporated; 1995-04-01 to 1997-04-26; source msha-controller-operator-history
- **controller_controls_mine:** Lance  Nelsen → Blue Rok Incorporated; 1995-04-01 to 1997-04-26; source msha-controller-operator-history
- **controller_controls_operator:** Lance  Nelsen → Steinhatchee Construction & Development Co Inc; 1995-04-01 to 1997-04-26; source msha-controller-operator-history
- **operator_operates_mine:** Nolan Blue & Associates Inc → Blue Rok Incorporated; 1997-04-27 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Nolan  Blue → Blue Rok Incorporated; 1997-04-27 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Nolan  Blue → Nolan Blue & Associates Inc; 1997-04-27 to 1998-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Denali Inc → Blue Rok Incorporated; 1998-05-01 to 1998-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Dickert  et al → Blue Rok Incorporated; 1998-05-01 to 1998-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Dickert  et al → Denali Inc; 1998-05-01 to 1998-11-01; source msha-controller-operator-history
- **operator_operates_mine:** Blue Rok Incorporated → Blue Rok Incorporated; 1998-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marla Sue  Blue → Blue Rok Incorporated; 1998-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marla Sue  Blue → Blue Rok Incorporated; 1998-11-02 to current/open; source msha-controller-operator-history