# Relationship history for MSHA mine 1507782

Current hierarchy: **Donn A  Chickering → Branham & Baker Coal Company Inc → J & M #1 Surface 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:** Bailey Lexie → J & M #1 Surface Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donn A  Chickering → J & M #1 Surface Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ken-Lick Coal Inc → J & M #1 Surface Mine; 1974-01-01 to 1987-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Lexie → Ken-Lick Coal Inc; 1974-01-01 to 1987-03-03; source msha-controller-operator-history
- **operator_operates_mine:** J & M Mining Inc → J & M #1 Surface Mine; 1987-03-04 to 1989-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Martin Jack Z → J & M #1 Surface Mine; 1987-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Jack Z → J & M Mining Inc; 1987-03-04 to 1989-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Branham & Baker Coal Company Inc → J & M #1 Surface Mine; 1989-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donn A  Chickering → Branham & Baker Coal Company Inc; 1989-03-03 to current/open; source msha-controller-operator-history