. The World almanac and encyclopedia. band, Case and Battery. , Junior Deaf-Phone For People WithImpaired Hearing V j C Complete MIOROPHO JUiNIOR •DEAF-PHONB is i, amn^r- DETECTAGRAPH $15 Bensitive lostrument whioh has been developed to meet the dema-ndslor a practical and efficient Oiearing device at an extremely lowprice. It IS equal to any $ instrument made and superior tomost of them. The outfit consists of One Super-Sensitive Transmitter with cord connector- One Siiner Spn«iitivpEar Piece with small black cord; One Black Single HeadbandTBlack Case itid Two B^teries! Improved Su

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. The World almanac and encyclopedia. band, Case and Battery. , Junior Deaf-Phone For People WithImpaired Hearing V j C Complete MIOROPHO JUiNIOR •DEAF-PHONB is i, amn^r- DETECTAGRAPH $15 Bensitive lostrument whioh has been developed to meet the dema-ndslor a practical and efficient Oiearing device at an extremely lowprice. It IS equal to any $ instrument made and superior tomost of them. The outfit consists of One Super-Sensitive Transmitter with cord connector- One Siiner Spn«iitivpEar Piece with small black cord; One Black Single HeadbandTBlack Case itid Two B^teries! Improved Super-SensitiveMicrophone, Only $ hn^M^,^ instrument is offered at an extremely low price. It is excellent for,buildiug your own radio amplmer. Can also be used in many experimentsnJiere a sensitive microi>lione is required Send for One and Convince Yourself MICROPHO-DETECTOR CO. ^^^^^^^^i^e^sidfnT^*^*^^^^&hle*^SoarS*« 26 Coftlandt St., NEW YORK

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