US178847A - Improvement in blackboard-rubbers - Google Patents

Improvement in blackboard-rubbers Download PDF

Info

Publication number
US178847A
US178847A US178847DA US178847A US 178847 A US178847 A US 178847A US 178847D A US178847D A US 178847DA US 178847 A US178847 A US 178847A
Authority
US
United States
Prior art keywords
blackboard
rubbers
improvement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Publication date
Application granted granted Critical
Publication of US178847A publication Critical patent/US178847A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/02Floor surfacing or polishing machines
    • A47L11/10Floor surfacing or polishing machines motor-driven
    • A47L11/14Floor surfacing or polishing machines motor-driven with rotating tools
    • A47L11/16Floor surfacing or polishing machines motor-driven with rotating tools the tools being disc brushes
    • A47L11/164Parts or details of the brushing tools

Description

US178847D Improvement in blackboard-rubbers Expired - Lifetime US178847A (en)

Publications (1)

Publication Number Publication Date
US178847A true US178847A (en) 1876-06-20

Family

ID=2248254

Family Applications (1)

Application Number Title Priority Date Filing Date
US178847D Expired - Lifetime US178847A (en) Improvement in blackboard-rubbers

Country Status (1)

Country Link
US (1) US178847A (en)

Similar Documents

Publication Publication Date Title
US178096A (en) Improvement in clothes-sprinklers
US182377A (en) Improvement in sugar-mills
US175866A (en) Improvement in fog-signals
US179931A (en) Improvement in nut-locks
US173478A (en) Improvement in zitherns
US185264A (en) Improvement in cigar-machines
US185800A (en) Improvement in vehicle-hubs
US178847A (en) Improvement in blackboard-rubbers
US174205A (en) Improveivient in hog-traps
US183071A (en) Improvement in-shaft-couplings
US192879A (en) Improvement in store-reachers
US207319A (en) Improvement in indicators
US207431A (en) Improvement in bootees
US222770A (en) Improvement in hose
US217727A (en) Improvement in gun-wads
US177454A (en) Improvement in fire-boxes for boilers
ES5477H1 (es) Perfeccionamientos en la fabricacion de gas para calefaccion y otros usos, y en las materias y aparatos utilizados.
ES5443H1 (es) Aparato soporte-aislador para uso de los telegrafos electricos
ES5441H1 (es) Mejoras en la ignicion continua de las mechas y en la composicion empleada para la cerillas fosforica en general.
ES5566H1 (es) Procedimiento de anuncios luminosos
ES5452H1 (es) Aparato llamado "palanca empujadora" para mover a mano vagones del ferrocarril o de tranvia, curenas de canon, etc.
ES5434H1 (es) Maquina para fabricar enverjados sin torsion, de alambre de hierro sin cocer.
ES5396H1 (es) Grasa invulnerable para neutralizar la accion del fuego y de la oxidacion en los metales y maderas.
ES5432H3 (es) Maquina para cardar o peinar las palmas de palmito o de palmera, esparto y cualquier otra materia textil o fibrosa.
ES5402H1 (es) Aprovechamiento de los combustibles pulverizados unidos a corrientes de aire como medio de calefaccion