# Relationship history for MSHA mine 1510982

Current hierarchy: **Converse Walter C → Tyger Energy Inc → Welco 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

- **operator_operates_mine:** Lakewood Coal Sales Inc → Welco Tipple; 1977-09-01 to 1988-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Allen James R → Welco Tipple; 1977-09-01 to 1988-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Allen James R → Lakewood Coal Sales Inc; 1977-09-01 to 1988-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Northern Processing Company → Welco Tipple; 1988-01-19 to 1992-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Cornett Earl M & Warren J Mullins → Welco Tipple; 1988-01-19 to 1992-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Cornett Earl M & Warren J Mullins → Northern Processing Company; 1988-01-19 to 1992-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Excel Coal Corp → Welco Tipple; 1992-11-01 to 1993-11-28; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Graves → Welco Tipple; 1992-11-01 to 1993-11-28; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Graves → Excel Coal Corp; 1992-11-01 to 1993-11-28; source msha-controller-operator-history
- **operator_operates_mine:** Tyger Energy Inc → Welco Tipple; 1993-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Converse Walter C → Welco Tipple; 1993-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Converse Walter C → Tyger Energy Inc; 1993-11-29 to current/open; source msha-controller-operator-history