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new manufacturers installations collection restorations timeline identification publications glossary mailing list site map links about contact	bth catalogues bth general catalogue Circa: Early 1950s This book of BTH's electrical items included a brief section on street lighting. Highway Engineers' Reference Book 1947 Circa: 1947 Some of BTH's lanterns and their uses were covered in this reference. Highway Engineers' Reference Book 1951 Circa: 1951 Some of BTH's lanterns and their uses were covered in this reference.