# Relationship history for MSHA mine 1800776

Current hierarchy: **KTRV LLC → Heritage Coal & Natural Resources, LLC → Walker 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:** Walker Brothers Mining, Inc. → Walker Mine; 2007-03-07 to 2019-02-10; source msha-controller-operator-history
- **controller_controls_mine:** George K  Walker → Walker Mine; 2007-03-07 to 2013-08-29; source msha-controller-operator-history
- **controller_controls_operator:** George K  Walker → Walker Brothers Mining, Inc.; 2007-03-07 to 2013-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Jody L  Ritchie → Walker Mine; 2007-11-30 to 2022-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Angela  Svonavec → Walker Mine; 2008-09-03 to 2024-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Samuel  Walker → Walker Mine; 2013-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Samuel  Walker → Walker Brothers Mining, Inc.; 2013-08-30 to 2019-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Beechwood Coal, LLC → Walker Mine; 2019-02-11 to 2021-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Jody L  Ritchie → Beechwood Coal, LLC; 2019-02-11 to 2021-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Heritage Coal & Natural Resources, LLC → Walker Mine; 2021-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Angela  Svonavec → Heritage Coal & Natural Resources, LLC; 2021-07-14 to 2024-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Jody L Ritchie et al → Walker Mine; 2022-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jody L Ritchie et al → Beechwood Coal, LLC; 2022-03-16 to 2021-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Faith  Ritchie et al → Beechwood Coal, LLC; 2022-03-16 to 2021-07-13; source msha-controller-operator-history
- **controller_controls_mine:** KTRV LLC → Walker Mine; 2024-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** KTRV LLC → Heritage Coal & Natural Resources, LLC; 2024-02-05 to current/open; source msha-controller-operator-history