# Relationship history for MSHA mine 4405408

Current hierarchy: **Taylor Ottis → Tracy Gap Coal Company Inc → No 1 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:** M F M Coal Corp → No 1 Mine; 1980-04-01 to 1980-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Monahan William Robert Et Al → No 1 Mine; 1980-04-01 to 1980-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Monahan William Robert Et Al → M F M Coal Corp; 1980-04-01 to 1980-11-24; source msha-controller-operator-history
- **operator_operates_mine:** Tracy Gap Coal Company Inc → No 1 Mine; 1980-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Ottis → No 1 Mine; 1980-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Ottis → Tracy Gap Coal Company Inc; 1980-11-25 to current/open; source msha-controller-operator-history