# Relationship history for MSHA mine 2901266

Current hierarchy: **Stroening R A → T S M Corp → T S M #1**

- 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:** Seven D G Inc → T S M #1; 1950-01-01 to 1988-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Mercer Daryl & George Mac Clure → T S M #1; 1950-01-01 to 1988-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Mercer Daryl & George Mac Clure → Seven D G Inc; 1950-01-01 to 1988-03-08; source msha-controller-operator-history
- **operator_operates_mine:** T S M Corp → T S M #1; 1988-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stroening R A → T S M #1; 1988-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stroening R A → T S M Corp; 1988-03-09 to current/open; source msha-controller-operator-history