WHAT TO INVENT The author will be glad to answer questions relating to these and to other types of inventions. However, no letter will be answered unless a properly stamped and self-addressed envelope is enclosed. Do not send any models. By Raymond Francis Yates HOW is your ingenuity today?
WHAT TO INVENT - Mechanics And Handicraft (Oct, 1937) 
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WHAT TO INVENT - Mechanics And Handicraft (Oct, 1937) 
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WHAT TO INVENT The author will be glad to answer questions relating to these and to other types of inventions. However, no letter will be answered unless a properly stamped and self-addressed envelope is enclosed. Do not send any models. By Raymond Francis Yates HOW is your ingenuity today?
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