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	1.	No cover image available How to make working diagram models illustrating electrical principles by H.R. Langman by Langman, H.R Material type: Text Publication details: Elec. Eng. 1953 Availability: Items available for reference: JRD Tata Memorial Library: Not for loan (1)Call number: 621.3 N533.
	2.	No cover image available Electrical horology by H.R. Langman, A. Ball. by Langman, H.R Ball, A Edition: 3rd. Material type: Text Publication details: London Techn. Press Ltd. 1935 Availability: Items available for reference: JRD Tata Memorial Library: Not for loan (1)Call number: 681.116 N35.
	3.	No cover image available Electrical handicraftsman and experimenter's manual by H R Langman and J H Moore by Langman, H R Moore, J H Material type: Text Publication details: London Technical press 1948 Availability: Items available for loan: JRD Tata Memorial Library (1)Call number: 621.31042 N481. Place hold

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