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	| Type | Model No. | Maker | Country | Construction Material | Date | Scale Length | Area of Use | 
	
			| Linear | Gen-15-A | Perrygraf Corporation | USA | Plastic & Cardstock | 1965 | 10cm x 27.1cm | Blackbody Radiation | 
			
Notes: 1) Used for infrared radiation calculations 2) Made for General Electric 3) Widely distributed throught out the engineering community 4) Model 15-A was the original version
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