12 US patents in the B26B21 classification group during the 1870s

1872-02-20 US123839 Improvement in moustache-guards

1873-02-11 US135793 Improvement in razors

1874-02-17 US147725 George a

1874-10-06 US155643 Improvement in razors

1876-04-18 US176175 Improvement in moustache-guards

1876-06-27 US179255 Improvement in razors

1876-10-03 US182904 Improvement in razor-backs

1876-10-10 US183240 Improvement in combined comb and hair-cutter

1878-07-30 US206473 Improvement in shaving apparatus

1879-10-07 US220438 Improvement in razors and knives

1879-10-14 US220538 Improvement in mustache-guards

1879-11-04 US221352 Improvement in the manufacture of razors