Building inspector's hand book of Philadelphia, Penna. : containing the building laws of Philadelphia, plumbing, sewerage and sanitary rules and regulations, mechanics' lien law of the state, supplement of the lien law, house heating and ventilating, electric laws, rules and suggestions, glossary of electric terms, steam boiler and steam engine laws, rules, etc. : a complete hand book for architects, engineers, contractors, builders, plumbers, and any who are engaged in the erection of buildings : directory of architects, contractors, and builders, manufacturers and dealers in building material /