# Relationship history for MSHA mine 1510969

Current hierarchy: **Massey Energy Company → Ratliff Elkhorn Coal Company Inc → No 109 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

- **controller_controls_mine:** Greene Sherman → No 109 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Derry et al → No 109 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → No 109 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & F Coal Company → No 109 Mine; 1977-12-01 to 1978-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Hackney Black & Carl Blaine → No 109 Mine; 1977-12-01 to 1978-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Hackney Black & Carl Blaine → B & F Coal Company; 1977-12-01 to 1978-07-23; source msha-controller-operator-history
- **operator_operates_mine:** B & F Coal Company → No 109 Mine; 1978-07-24 to 1978-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Roy Dale & Baron Davis → No 109 Mine; 1978-07-24 to 1978-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Roy Dale & Baron Davis → B & F Coal Company; 1978-07-24 to 1978-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Punchin Judy Coal Company → No 109 Mine; 1978-11-16 to 1979-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Stiltner Carl--Grady & Jimmy Kinney → No 109 Mine; 1978-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stiltner Carl--Grady & Jimmy Kinney → Punchin Judy Coal Company; 1978-11-16 to 1979-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Pond Creek Coal Company → No 109 Mine; 1979-01-22 to 1979-05-06; source msha-controller-operator-history
- **controller_controls_operator:** Greene Sherman → Pond Creek Coal Company; 1979-01-22 to 1979-05-06; source msha-controller-operator-history
- **operator_operates_mine:** Bentley & Derry Coal Company Inc → No 109 Mine; 1979-05-07 to 1985-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Derry et al → Bentley & Derry Coal Company Inc; 1979-05-07 to 1985-01-08; source msha-controller-operator-history
- **controller_controls_operator:** James E Derry et al → Bentley & Derry Coal Company Inc; 1979-05-07 to 1985-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Ratliff Elkhorn Coal Company Inc → No 109 Mine; 1985-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Ratliff Elkhorn Coal Company Inc; 1985-01-09 to current/open; source msha-controller-operator-history