# Relationship history for MSHA mine 4405938

Current hierarchy: **Koch Industries Inc → Koch Carbon Inc → Raven No 2**

- 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:** Ellis  Baldwin → Raven No 2; 1975-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Koch Industries Inc → Raven No 2; 1979-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Varney Danny Et Al → Raven No 2; 1980-07-01 to 1984-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Spider Enterprise → Raven No 2; 1982-08-01 to 1982-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Varney Danny & Earnest-Dicky Matney → Raven No 2; 1982-08-01 to 1982-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Varney Danny & Earnest-Dicky Matney → Spider Enterprise; 1982-08-01 to 1982-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Linda Coal Company → Raven No 2; 1982-12-01 to 1984-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Varney Danny Et Al → Linda Coal Company; 1982-12-01 to 1984-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Nelson Mining Inc → Raven No 2; 1984-02-16 to 1985-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Nelson Kermit → Raven No 2; 1984-02-16 to 1985-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Nelson Kermit → Nelson Mining Inc; 1984-02-16 to 1985-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Nelson Mining Inc → Raven No 2; 1985-07-31 to 1988-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Sheppard Alvin → Raven No 2; 1985-07-31 to 1988-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Sheppard Alvin → Nelson Mining Inc; 1985-07-31 to 1988-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Little Widow Coal Company → Raven No 2; 1988-06-07 to 1990-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Vandyke David & W C Crabtree → Raven No 2; 1988-06-07 to 1990-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Vandyke David & W C Crabtree → Little Widow Coal Company; 1988-06-07 to 1990-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Baldwin Coal Company Inc → Raven No 2; 1990-05-15 to 1991-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Ellis  Baldwin → Baldwin Coal Company Inc; 1990-05-15 to 1991-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Koch Carbon Inc → Raven No 2; 1991-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koch Industries Inc → Koch Carbon Inc; 1991-09-17 to current/open; source msha-controller-operator-history