# Relationship history for MSHA mine 4103017

Current hierarchy: **Trumble Mike & Harvey Emmons → T & E Crushed Stone → Quintana Lease**

- 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:** James J Purvis Enterprises Inc → Quintana Lease; 1980-06-01 to 1981-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Purvis James J → Quintana Lease; 1980-06-01 to 1981-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Purvis James J → James J Purvis Enterprises Inc; 1980-06-01 to 1981-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Brazos Rock Company Inc → Quintana Lease; 1981-08-26 to 1986-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Glenlake Corp → Quintana Lease; 1981-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glenlake Corp → Brazos Rock Company Inc; 1981-08-26 to 1986-01-27; source msha-controller-operator-history
- **operator_operates_mine:** T & E Crushed Stone → Quintana Lease; 1986-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Trumble Mike & Harvey Emmons → Quintana Lease; 1986-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trumble Mike & Harvey Emmons → T & E Crushed Stone; 1986-01-28 to current/open; source msha-controller-operator-history