# Relationship history for MSHA mine 4607049

Current hierarchy: **Bonham James A → Bickford Mining Inc → No 2 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:** A T Coal Inc → No 2 Mine; 1985-12-01 to 1986-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Henry Dale  Shrewsbury → No 2 Mine; 1985-12-01 to 1986-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Henry Dale  Shrewsbury → A T Coal Inc; 1985-12-01 to 1986-08-31; source msha-controller-operator-history
- **operator_operates_mine:** A T Coal Inc → No 2 Mine; 1986-09-01 to 1991-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Wood Matthew → No 2 Mine; 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wood Matthew → A T Coal Inc; 1986-09-01 to 1991-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Bonham James A → No 2 Mine; 1991-01-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bickford Mining Inc → No 2 Mine; 1991-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bonham James A → Bickford Mining Inc; 1991-03-08 to current/open; source msha-controller-operator-history