#RETRACTABLE PLUMB BOB PDF#

The former has a top portionperforated to receive a swivel hook 215 which serves to suspend the housing from a transit, level or structure. The housing has an upper attachment portion 18 and a lower line-receiving portion 19. 1 and 2, the invention is shown as including a housing 10, usually made of mating halves 11 and 12 meeting at a mid-plane 13, this housing including peripheral walls 14 and 15 each having an arcuate portion 16 substantially concentric with an axis AA traversing a chamber 17 of the housing. G01C15/00- Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00.G01C- MEASURING DISTANCES, LEVELS OR BEARINGS SURVEYING NAVIGATION GYROSCOPIC INSTRUMENTS PHOTOGRAMMETRY OR VIDEOGRAMMETRY.

238000006011 modification reaction Methods 0.000 description 1.230000021037 unidirectional conjugation Effects 0.000 description 3.230000023298 conjugation with cellular fusion Effects 0.000 description 3.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Melvin S Kruse filed Critical Melvin S Kruse Priority to US419435A priority Critical patent/US2849805A/en Application granted granted Critical Publication of US2849805A publication Critical patent/US2849805A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US419435A Inventor Melvin S Kruse Original Assignee Melvin S Kruse Priority date (The priority date is an assumption and is not a legal conclusion.

#RETRACTABLE PLUMB BOB PDF#

Google Patents US2849805A - Retractable plumb bobĭownload PDF Info Publication number US2849805A US2849805A US419435A US41943554A US2849805A US 2849805 A US2849805 A US 2849805A US 419435 A US419435 A US 419435A US 41943554 A US41943554 A US 41943554A US 2849805 A US2849805 A US 2849805A Authority US United States Prior art keywords line reel housing wall friction Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.