# Relationship history for MSHA mine 2900906

Current hierarchy: **Pueblo Of Isleta Indian Tribe → Isleta Cinder & Gravel → ISLETA PITS**

- 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:** Rocky Mountain Stone Company → ISLETA PITS; 1950-01-01 to 1986-02-03; source msha-controller-operator-history
- **controller_controls_mine:** Vincent J  Lardner III et al → ISLETA PITS; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent J  Lardner III et al → Rocky Mountain Stone Company; 1950-01-01 to 1986-02-03; source msha-controller-operator-history
- **operator_operates_mine:** Isleta Cinder & Gravel → ISLETA PITS; 1986-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pueblo Of Isleta Indian Tribe → ISLETA PITS; 1986-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pueblo Of Isleta Indian Tribe → Isleta Cinder & Gravel; 1986-02-04 to current/open; source msha-controller-operator-history