# Relationship history for MSHA mine 4104078

Current hierarchy: **Webb County Holdings Lp; Bee Zee Properties Ltd → Border Materials Lp → 7-11 PIT**

- 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:** Black'S Construction & Caliche Pit → 7-11 PIT; 1999-03-01 to 2000-07-06; source msha-controller-operator-history
- **controller_controls_mine:** Yolanda  Black  et al → 7-11 PIT; 1999-03-01 to 2000-07-06; source msha-controller-operator-history
- **controller_controls_operator:** Yolanda  Black  et al → Black'S Construction & Caliche Pit; 1999-03-01 to 2000-07-06; source msha-controller-operator-history
- **operator_operates_mine:** Border Materials Lp → 7-11 PIT; 2000-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bee Zee Properties Ltd  et al → 7-11 PIT; 2000-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bee Zee Properties Ltd  et al → Border Materials Lp; 2000-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Webb County Holdings Lp  et al → Border Materials Lp; 2000-07-07 to current/open; source msha-controller-operator-history