# Relationship history for MSHA mine 1509782

Current hierarchy: **Colley Theodore T Jr & G Frank Ramsey → Colley & Ramsey Coal Company → No 3 Surface**

- 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:** Colley Theodore T Jr & G Frank Ramsey → No 3 Surface; 1974-09-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Colley & Ramsey Coal Company → No 3 Surface; 1976-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colley Theodore T Jr & G Frank Ramsey → Colley & Ramsey Coal Company; 1976-06-16 to current/open; source msha-controller-operator-history