- Publication Title:
- Boring or penetrating the earth.
- Display Title:
- Classification definitions. class 175. Boring or penetrating the earth.
- Series Title:
- Classification definitions.
- Corporate Agency Authors:
- Patent Office and Commerce Dept.
- Sort Author:
- Patent Office
- Author place:
- Washington, DC
- Author zip:
- 20231
- Date:
- Revision 1. Oct. 1968
- Publish Date ISO Format:
- 1968-01-01T00:00:00Z
- Publication Start:
- 19680101
- Publication End:
- 19681231
- Corporate/Agency Author:
- Patent Office
- Publication month:
- 13
- Publication year:
- 1968
- SuDoc number:
- C 21.3/2:(nos.)
- Description:
- [2] +4+69 p. 4°
- Notes:
- [Original classification by R. J. Chmiel and others.] and (Office of Examining and Documentation Control.) [Issued with perforations.]
- Notes:
- (Office of Examining and Documentation Control.) [Issued with perforations.] • Sent to Depository Libraries. Item 252
- Availability:
- † Distribution Made by Issuing Office. Paper, 75c. and • Sent to Depository Libraries. Item 252
- GPO Item number:
- 252
- Monthly Catalog date:
- January 1969
- Monthly Catalog issue number:
- 888
- Monthly Catalog page number:
- 1
- Monthly Catalog issue date:
- 1969-01-01T00:00:00Z
- Monthly Catalog entry number:
- 1284
- Record start page number:
- 84