# Relationship history for MSHA mine 4700102

Current hierarchy: **Bilsie Albert M → Bilsie'S Limestone & Gravel → FREITAG QUARRY #2**

- 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:** Glen J Lingard → FREITAG QUARRY #2; 1950-01-01 to 1980-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Lingard Glen J → FREITAG QUARRY #2; 1950-01-01 to 1980-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Lingard Glen J → Glen J Lingard; 1950-01-01 to 1980-04-20; source msha-controller-operator-history
- **operator_operates_mine:** S & H Limestone → FREITAG QUARRY #2; 1980-04-21 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Oliver O  Hanna et al → FREITAG QUARRY #2; 1980-04-21 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Oliver O  Hanna et al → S & H Limestone; 1980-04-21 to 1987-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Bilsie'S Limestone & Gravel → FREITAG QUARRY #2; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bilsie Albert M → FREITAG QUARRY #2; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bilsie Albert M → Bilsie'S Limestone & Gravel; 1987-04-01 to current/open; source msha-controller-operator-history