# Relationship history for MSHA mine 1511077

Current hierarchy: **Colley Theodore T Jr & G Frank Ramsey → Colley & Ramsey Coal Company → No 2 Tipple**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Colley Theodore T Jr & G Frank Ramsey → No 2 Tipple; 1974-09-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tri-Coal Company → No 2 Tipple; 1978-03-01 to 1979-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Adkins John J & John A--Wm L Clark & Paul J Justic → No 2 Tipple; 1978-03-01 to 1979-06-27; source msha-controller-operator-history
- **controller_controls_operator:** Adkins John J & John A--Wm L Clark & Paul J Justic → Tri-Coal Company; 1978-03-01 to 1979-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Hurricane Elkhorn Coal Corp Ii → No 2 Tipple; 1979-06-28 to 1985-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Schwab Charles F → No 2 Tipple; 1979-06-28 to 1985-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Schwab Charles F → Hurricane Elkhorn Coal Corp Ii; 1979-06-28 to 1985-10-16; source msha-controller-operator-history
- **operator_operates_mine:** Colley & Ramsey Coal Company → No 2 Tipple; 1985-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colley Theodore T Jr & G Frank Ramsey → Colley & Ramsey Coal Company; 1985-10-17 to current/open; source msha-controller-operator-history