# Relationship history for MSHA mine 1517145

Current hierarchy: **David  Bolling → Massive Mining Inc → Massive #2**

- 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:** W & W Coal Corp → Massive #2; 1991-10-01 to 1993-09-29; source msha-controller-operator-history
- **controller_controls_mine:** Webb Darrel → Massive #2; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Webb Darrel → W & W Coal Corp; 1991-10-01 to 1993-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Mayking Processing Company → Massive #2; 1993-09-30 to 1994-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Burke Tim → Massive #2; 1993-09-30 to 1994-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Burke Tim → Mayking Processing Company; 1993-09-30 to 1994-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Jeco Construction → Massive #2; 1994-08-15 to 1997-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Jason  Elkins → Massive #2; 1994-08-15 to 1997-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Elkins → Jeco Construction; 1994-08-15 to 1997-09-24; source msha-controller-operator-history
- **controller_controls_mine:** David  Bolling → Massive #2; 1996-03-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Massive Mining Inc → Massive #2; 1997-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Bolling → Massive Mining Inc; 1997-09-25 to current/open; source msha-controller-operator-history