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Thermometer backplate, with inscribed fahreheit scale

Thermometer backplate, with inscribed fahreheit scale

1820-1828
Back plate with lens mount for viewing screen

Back plate with lens mount for viewing screen

Back plate in unfilled Celanex (PBT)

Back plate in unfilled Celanex (PBT)

Four milled securing bolts and threaded circular back plates

Four milled securing bolts and threaded circular back plates