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Polygraph, model 5D, by Grass Instrument Co., Amer

Polygraph, model 5D, by Grass Instrument Co., Amer

1960-1970
Polygraph, model 5D, by Grass Instrument Co., Amer

Polygraph, model 5D, by Grass Instrument Co., Amer

1960-1970
Polygraph, model 5D, by Grass Instrument Co., Amer

Polygraph, model 5D, by Grass Instrument Co., Amer

1960-1970
Polygraph, model 5D, by Grass Instrument Co., Amer

Polygraph, model 5D, by Grass Instrument Co., Amer

1960-1970
Six rolls of Honeywell Strip Chart, for infrared sprectrophotometer, Perkin-Elmer model 12c, United States, 1944-1950

Six rolls of Honeywell Strip Chart, for infrared sprectrophotometer, Perkin-Elmer model 12c, United States, 1944-1950

1958-1987