# Relationship history for MSHA mine 1100394

Current hierarchy: **Florence L  Propheter → Bob Propheter Aggregates L. L. C. → Palmyra Quarry**

- 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:** Kehobe Materials Inc → Palmyra Quarry; 1950-01-01 to 1981-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Kemper → Palmyra Quarry; 1950-01-01 to 1983-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Kemper → Kehobe Materials Inc; 1950-01-01 to 1981-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Bob Propheter Aggregates L. L. C. → Palmyra Quarry; 1981-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Florence L  Propheter → Palmyra Quarry; 1981-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florence L  Propheter → Bob Propheter Aggregates L. L. C.; 1981-02-01 to current/open; source msha-controller-operator-history