# Relationship history for MSHA mine 1600999

Current hierarchy: **David E  Joshlin → Texana Aggregates Company → TEXANA AGGREGATES CO.**

- 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:** Southwest Sand & Gravel-Joint Venture → TEXANA AGGREGATES CO.; 1981-03-01 to 1994-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Oklahoma Rock Corp-Charles E Lattimore Jr → TEXANA AGGREGATES CO.; 1981-03-01 to 1994-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Oklahoma Rock Corp-Charles E Lattimore Jr → Southwest Sand & Gravel-Joint Venture; 1981-03-01 to 1994-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Texana Aggregates Company → TEXANA AGGREGATES CO.; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David E  Joshlin → TEXANA AGGREGATES CO.; 1994-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David E  Joshlin → Texana Aggregates Company; 1994-09-01 to current/open; source msha-controller-operator-history