# Relationship history for MSHA mine 0501329

Current hierarchy: **Caroline  Waldow; Nick  Waldow → Flintstone Gravel Pit Inc. → Pickering Family 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:** Certified Reddi Mix Inc → Pickering Family Pit; 1950-01-01 to 1984-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Edgar D  Harris → Pickering Family Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edgar D  Harris → Certified Reddi Mix Inc; 1950-01-01 to 1984-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Flintstone Gravel → Pickering Family Pit; 1984-08-15 to 2007-04-14; source msha-controller-operator-history
- **controller_controls_mine:** A D  Tillotson → Pickering Family Pit; 1984-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A D  Tillotson → Flintstone Gravel; 1984-08-15 to 2007-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Flintstone Gravel & Trucking Inc → Pickering Family Pit; 2007-04-15 to 2022-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Terry L  Pratt et al → Pickering Family Pit; 2007-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry L  Pratt et al → Flintstone Gravel & Trucking Inc; 2007-04-15 to 2022-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Ted J  Pratt et al → Flintstone Gravel & Trucking Inc; 2007-04-15 to 2022-02-24; source msha-controller-operator-history
- **operator_operates_mine:** Flintstone Gravel Pit Inc. → Pickering Family Pit; 2022-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Caroline  Waldow et al → Pickering Family Pit; 2022-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caroline  Waldow et al → Flintstone Gravel Pit Inc.; 2022-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick  Waldow et al → Flintstone Gravel Pit Inc.; 2022-02-25 to current/open; source msha-controller-operator-history